[[Help] Is it possible to use the Portal Gun mod?]

There are plugins that do similar things tho.

http://forums.bukkit.org/threads/fun-tp-mech-portalstick-v2-3-7-portal-gun-in-minecraft-1-2.14684/

[Quarry Frame Not Building?]

Beware tho that opping the mods allows them to bypass any protection plugin you might have, therefor people are able to grief using the quarry.

[help with protecting areas and mod harmony]

Well, the block placing thing is in the stickies for one.

[Buying a dedicated Tekkit server]

Using fluctis hosting myself, only had it for a few days, but so far so good. Didn't have to pay any extra for tekkit(except more ram use). I´ts much cheaper than the one posted earlier, seen no real lag on the server so far and support has been good, they have a good control panel and you can get direct access to your server files using ftp as well as editing them from your browser.