snowskijunky:
I was thinking for the motor controller I could just use four of these: https://www.sparkfun.com/products/10213 in an h-bridge config like this: https://i.stack.imgur.com/s9Uvc.pngEach one can dissipate 75w with an operating temp range of -55 to +175C. From the sound of it, that would be fine, and four of those guys would take up less space than the MD10C.
Yes, but the drivers for 4 N-MOSFETs will take up more space. A motor driver IC will always take less space than the equivalent 4 MOSFETs. The only reason for using discrete devices is when your current or voltage is too high for the available ICs.