The enclosure the Cobra is designed to fit is probably exactly what you want, although might be short on space for the battery, depending on what you want. That manufacturer has other options from what I rememberā¦
You should also watch some of the Ben Heck episodes (I think, 84, 85, 87, 88, 93, 94 area) where he talks through designing a custom case.
You guys have too many mainboards?!? Consider sending your excess boards etc to Duke Nukemās home for unwanted Gadgeteer stuff, where your unwanted mainboards and modules can feel loved and needed once again.
Thanks Brett, I have never heard of the Ben Heck show until I saw your post here. Currently watching some of them on Youtube, and really enjoying it I have not yet found the episode you are referring to, but that does not matter as the ones Iām watching is entertaining enough already.
Soldering a SODIMM connector is going to be fairly non-trivial, Iām guessing. Going with the 144-pin LQFP might make it necessary, but if we were sticking with 100-pin devices, thereās probably easier options.
As for pin compatibility with G400, you might be able to work something out, but the STM32F429, at least, has a lot more I/O peripherals.