I've seen those and they seem nice. Problem is to get them for a reasonable price here. I found the picoPSU-120W and a 12V 5A brick for ~170 USD (incl VAT) in a Norwegian netshop, but I don't know if the power brick would be big enough. I guess it will. I haven't been able to find any power figures for the mainboard. It would only be the mainboard with a couple of 2.5" drives and possibly a couple of USB devices.

Edit: Checked the status and they were out of stock. Bummer. They did have another kit, rated for 60W, with a brick and a bigger PCB that would need to be mounted inside a case, and this kit was ~80 USD. Looks like it might be a M1-ATX PSU.

Stig