My own old case -

http://www.port23.co.uk/synthdiy/a100/

That one was designed for battery use, but the same subracks are now mounted
in non-portable cases, and powered off this -

http://www.port23.co.uk/doepfer1.jpg

which contains a powerone hbb 1.5 a (its bolted tightly to the lid to help
with the thermal dissipation)

Julian