Thanks Pacman, I overlooked that the Samsung 250GB 2,5″ SSD is 5V. So I don’t need 12V. That changes a lot on the power supply options.
The drive use 3,5W.
Going for the eMMC option probably, unless the cheap-out OS on SSD is fast enough.
Going to download the schematics to see how best to feed the 5V into the system, or that I better can distribute the 5V power directly to the external devices.
Thanks for helping out so far. A lot to look into this weekend.
I’ll post my findings next week.