Air cooled. I'm probably 1-2 work days away from ordering pcbs, in a perfect world where I actually had 1-2 days to work on it, and then had the money to order the pcb. haha. This is a picture of the layout with one high side and one low side driver:
I need to change the spacing for the 3 different ground planes, but it's just a rough draft. I need to add 1 more driver to the high side and 1 more to the low side. Synchronous rectification is really really touchy because of the possibility of high and low side being turned on at the same time by accident (even a little glitch I think could short the mosfets). I was thinking of using 4 isolated 12v supplies. One for each driver. Fran was telling me about a different tricky way that simulates isolation using some small inductors and capacitors as the pseudo isolated power supplies, so I might try that instead, but I'm a brute force, totally inelegant sort of guy. haha. (it's true)