Thanks Steve.
I design my boards on my Mac, save it as an EPS, have a service bureau print it out on film (emulsion side down) then contact it with copper. Expose with flourescent light, then develop and etch. Works great, but I did have to buy a proper flourescent light fixture. The time for exposure is very precise with this fixture, and worked much better than using my photo enlarger.
The other idea I had was to mount the 4 chips onto the heatsink, then hardwire everything, using a piece of unetched copper PCB as a ground plane. Anything that needs to go to ground just gets soldered to the copper sheet, which would be just below the chips. Could even use wire wrap wire IC sockets tacked to the copper for the servo chips. Use a socket with more pins than the opamp, extra pins get soldered to the copper for support, the rest get bent up for making your connections. Not as elegant as an etched board, but quicker and easier.
RonS