Doepfer

The solution could be a 5V power supply module made like the Power  
Supply module in the portable cases. It could be sold with a beefed  
up buss board to replace the installed one (but then there would have  
to be a AS and Doepfer versions) or it could just connect directly to  
the modules with molex connectors (the classic PC power connectors  
would work). It would plug into the additional AC connectors that  
Dieter mentioned or in worse case scenario there would be a front  
mounted IEC connector like the Portable cases. You would have to  
mount it at the end of the row and the it would only want CV type  
modules next to it but it would be the most elegant solution with the  
least amount of user involvement (at least the direct connect - no  
buss version).

-James