Hi Andreas,
a friend of mine is building a 6U case (made of plexiglass!!! I´ll add a photo to Yahoo when it´s ready.) and he has the same problem.
As you mentioned you need the busboard, the power supply, the plate and additionally the power inlet. Although it isn´t mentioned anywhere, you can order it from Doepfer. It comes with the power switch and the cables to connect it to the power supply. Costs 13 Euro.
Hope I could help you.

bye



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