I was able to desolder 6 more mosfets from boards, so that should give me plenty for prototyping. I'm getting pretty good at desoldering SMD components. Yesterday, I broke 2 of the 4 that I tried to remove and today, I got all 6 in perfect condition.

So, I went ahead and built a prototype logic level converter to make sure the components I have would work. So I built it on some 20 year old perf board (it really is) and soldered the smd components, some through hole resistors and some wires on the board and tested it. It tested as expected and was able to determine the logic both ways at the correct voltages, so I can incorporate that into my design since I already have the parts.

The design is still coming along. With so many planned connectors, there's a lot to squeeze into a board that won't be any bigger than the arduino mega 2560 (Approx 4 in. x 2.1 in.). Additionally, I have the challenge of using the light version of eagle, which limits your schematic to 1 page, so I need to carefully arrange it on the page so I can fit it all in. Honestly, I'm not sure how well it will work, but I won't know until I try everything I can. I figure the worst case is that I need to have fewer connectors than I originally planned. Anyhow, I'll keep working away at it.