HERE is the link to more pics on the MOD.
"How the capacitors are attached to the copper tube, + and - cords?"
-What I did was lay the cap down, trim the leads on them, wrap tape around it once to make sure they don't move... then lay the +, or - leads onto one of the copper bars, then using a decently powered soldering iron, use alot of solder to bond them to the copper bars. I kinda slid the iron along while applying the solder behind it as the copper had alot of thermal capacity to do this.
"Also, how are the FET clamp + heatsink and Quark put together to get correct pressure between copper and fets?"
-The FET clamp is aluminum, Mike made it for me, so if you want one you could ask him if he still has the CAD file to machine it again? But, I just took the maximum thickness (can't remember exactly), something around 5mm from FET surface to FET surface, IIRC... then used that. The clamp was quite tight yes, I felt like it was going to crack something, but it was fine. It was perfect pressure on the FETs, it sucked every lat bit of heat from them and efficiently transfered it to the large heatsink (overkill) I got from a PC video card that died. How the FET clamp is attached is by thermal adhesive paste (arctic silver brand)... and that worked great!
In the end though, the Quark ended being killed... because it was mounted in a stupid spot, and when doing a wheelie, the truck flipped over and put alot of pressure on the body shell, and the Quark was right underneath, and pushed on the 'brains' board and shorted soemthing out, killing the brains board, the power board on it is fine however! I am going to redo this mod with the Quark I have now, as summer heat is on the way...
Hope this helps! Any other questions?