I was thinking about mounting the motherboard vertically with the cables coming out of the top, but the more I think about it, it seems like the most efficient use of space would be to put the PSU up there…not sure what else—hard drives, reservoirs, or duel slot load drives.
Almost all of the case will be SS, there might be some aluminum pieces, but I need to be careful about cathodic reactions—ran into problems with this before.
I am going to use MS hardware and captive fasteners for everything. The entire case will be able to be disassembled; I will be able to change it in the future that way.
Not sure about the motherboard tray yet, but I was thinking about mounting it on a sliding rail.