I've tested this setup:
BC Pump (lava) --> BC Tanks (lava)
BC Tanks (lava) --> RP Deployer w/ Filter (buckets of lava)
RP Deployer w/ Filter (buckets of lava)--> Auto crafting table Mk2
This auto crafting table combines features from the RP Project Table and the BC Automatic Crafting Table. When experimenting with it, I discovered that items crafted can be pumped *seemingly* only out of the top of the table, while you can pump items from its inventory out of the sides. So:
ACT MK2 (top, lava cells) --> Ender Chest
ACT MK2 (side, empty buckets) --> RP Deployer
To extract only the empty buckets out of the side, and not empty cells or lava buckets, I used an advanced wooden transport pipe with a bucket inside the filter. You could probably accomplish the same thing with a RP Filter, but I prefer the simplicity of BC stuff.
Here's a picture of my extremely simple and very messy setup:
The one lever turns on and off the entire system, the steam engine has an automatic shut-off made by the redstone pipe, and the RP Deployer and Filter are set on timers. It's best to have the filter on a faster setting than the deployer; in my setup the deployer is set on 3.5 seconds and the filter is set on .5 seconds. This reduces clogging. When I was testing it, it had a small jam a little while after it was turned on, but it resolved itself once the buckets in the system were set on a good timing by the machines.
If you didn't understand that last sentence, don't worry. I didn't either while I was writing it XD.
As for transferring lava to the overworld and converting it back into tubes, the only way Ive seen so far is to pump it out with either a RP pump (pump--> holding facility) or a BC pump
(pump --> tank), convert it into buckets using a deployer, and using an ender chest to ship it to the overworld. From there, extract the buckets into a RP deployer, then use the deployer to dump the buckets into a BC tank or some fancy holding facility, then put it into RP or BC pipes.
Hope this helped.
