Don't worry, Margus, you'll do fine. The only bits that I'd add are one or two titanium aquarium heaters and a small pump, and maybe a bit bigger plastic tank, all pretty cheap. Also, if you can scrounge a small programmable timer with audible signals, that would make your job even easier. But this is probably nitpicking, since I develop others' films so need to make sure both temp & time are close to required. Have fun!

OT: did you manage to get the G4 and 2904 card to work?