CandCNC has great electronics setups, get a THC from them. I have built two very good tables thus far. CNC Router parts has reduction drives and linear carriages. Hypertherm plasmas are great and hookup very quickly to any CNC setup. If you have any questions, please ask.
TAB - do you have any pics of the roller table? I have been wanting to develop one for my 4x8
Pic is a home built machine and runs perfectly.