I just spent a few days working with support at Akliz getting Tekkit Lite 0.6.1 working with MCPC and Multiverse-2.5. The tech suggested that I post how I did on these forums, so here it is.
I've removed the download links from the post, as these appear to be a violation of forum rules without pre-approval.
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Note: These instructions are for installing Multiverse-Core-2.5 under Tekkit Lite 0.6.1 (the Akziz default Tekkit Lite installation.) Steps 1-3 also enabled me to install Multiworld, but I found Multiverse to be a better package, especially with the addition of Multiverse-Portals. I tried Multiworld to see if it would bypass the bugs listed at the bottom. It didn't, so I went back to Multiverse.
Step 1.
Start with an install of Tekkit-Server-0.6.1 (the akziz default). If you have an existing world, make a backup of it.
Step 2
Remove the mods "Chicken Chunks" and "Dimensional Doors."
Step 3
Download mcpc-plus-legacy-1.4.7-R1.1-SNAPSHOT-f534-L13.jar and copy it to the main directory.
Step 4
Using the Akliz Command center, select "Game Update" under "Loaded Games" on the left. At the bottom, under "Custom JAR", select the mcpc-plus-legacy-1.4.7-R1.1-SNAPSHOT-f534-L13.jar.
(No idea how to do this on other hosts, but I imagine it's not rocket science to people who play with Mods.)
Step 5
Copy the Multiverse-Core-2.5.jar file to your "plugins" folder. ( If you don't have one, create one. ) Also add any other plugins, such as Multiverse-Portals-2.4 and world-generators.
Step 6
Make any changes to server.properties that you want.
Step 7
Start your server. Once the server is running, you should be able to verify that multiverse is running by logging in and typing the following:
/mvl
Will display a list of worlds-- to start with you'll have three-- the overword, the nether, and the end.
/mvc world_new normal
Will generate a new world in the folder world_new.
/mvtp world_new
Will teleport you to the new world.
Step 8
Spend some time on these webpages:
https://github.com/Multiverse/Multiverse-Core/wiki/World-properties
This is a list of all the properties you can set in a world, and how to set them.
https://github.com/Multiverse/Multiverse-Core/wiki/Command-Reference
This is a list of all the Multiverse commands.
https://github.com/Multiverse/Multiverse-Portals/wiki/Command-Reference
Multiverse Portals Commands. If you DIDN'T install Multiverse-Portals, read it anyway, to see why you want to.
Bugs that I've identified:
1) Wireless Redstone
A) In worlds other than the "Main" worlds-- the one defined in server.properties, and its corresponding nether and end worlds-- wireless receivers will only detect the state that the frequency was in at the time the frequency was set-- if it was on, it stays on, otherwise it stays off. If you reset the frequency, it will get the new state... but it will hold that until you reset the frequency again.
In the main worlds, wireless receivers have to be reset each time the server reboots. (I saw several references to it being a known issue when I took to google to find a solution (which I did not), but mysteriously, the problem seems to have gone away. See item 1 under "Problems I've run into."
2) Transport Pipes
The animation of items moving through transport pipes does not work except in main worlds. The items are still activate redstone pipes, you just can't SEE them.
3) While teleporting to alternate worlds is almost instant, teleporting back to the main world takes a little time.
Problems that I've run into:
1) Initial experiments starting up mcpc with my existing world intact led to server crashes. I was able to bypass this problem by renaming my world and creating a new one, then importing my old world with "/mv import world_old normal". I believe that removing dimensional doors resolved this problem, as this no longer happens. (Additionally, I removed the Dimensional Doors folder, since that was 50MB of data that no longer used the plugin. While I was in there, I removed the "chickenchunks" and "RedstoneEther" folders, the former because the plug in was removed, the latter just to see if it would have any effect on item 1 under "Bugs." It seems to have fixed Bug 1B, but I didn't expect it to, and can't see how it would, as that bug is replicated in new worlds. I mention it here just in case it helps you.)
2) When I first installed multiverse, you could teleport to alternate worlds, but after a minute or so the world would dematerialize (except for spawns, which were kind of entertaining to see plummet to their deaths). Removing ChickenChunks solved that.
3) Sometimes-- often-- the spawn point on a new world is in an unsafe place. Switch to creative mode to survive, get to a safe place, and type "/mv setspawn". This will set the the spawn to your world to the exact spot (including direction, and angle of head) that you are in.
4) Obviously, I did a lot of playing around with creating and deleting new worlds. They didn't always want to remove from the config. But if you stop the server, delete the folder, and restart the server, they'll delete with no problem.
5) Some phased transport pipes had to be reset, but they worked normally afterwards.
Useful notes:
Seriously, look over the things you can set in worlds and portals. In addition to world and portal management, the Multiverse package gives some seriously detailed world customization abilities.
You can change the name of the world in server.properties, and a new world will generate. The old one will remain in the configuration, although since it is no longer the world defined in server.properties, the bugs listed above will take effect. You can switch back after the world is created, and they'll go away. This is useful for custom superflat worlds, which I haven't figured out how to generate through Multiverse. Of course, as you create each world this way, a _nether and _the_end world will be created (and added to the configuration), but these can be removed when you are done.
If you precede all world names with "world_" when you generate them, then they will show up together in a file listing. Name your primary world "world_" and the nether and end worlds will clump together. You can change the visible name of a world with "/mvm set alias NewName world_name". If you want to have a space in the name, just put the name in quotes.
When entering a world, players are changed to the default game mode of that world.
If you want to change the folder name of a world, you can do so, but change the reference in plugins/Multiverse-Core/worlds.yml.
Multiverse Portals go by location, not any attachment to the block. So you can build a Portal then remove the blocks you used to anchor it, and it will still work.