I was considering putting the whole setup in a tower... but, I reckon I'll keep it original.
However, I'm going to try and stuff an AT (maybe ATX) power supply in the external CDrom drive case, and use that to power everything. A500 and A590, plus of course the cd rom drive, possibly the GBS8200, and anything else that needs power
The space behind the drive is the size of a full sized PSU PCB... so we'll see how that goes
May end up trying to find a smaller psu.