To power it, I was thinking about picking up one of those Valere or Eltek 1U or 2U rectifier shelves.  Anyone else tried one?

We've successfully used some 48v power supply from "MEANWELL". I don't have the model number to hand.

Not sure about osmo-bsc/pcu talking to DUS or other with SIU etc.. theoretically, I suppose yes.

IIUC, the osmo-pcu support for DUG was originally with SIU only, but recently got updated to work over E1, so I guess we could expect that osmo-bsc also worked at some point in time. Support might not be in master though.

Maybe somebody else here has tried to bring up a DUS 41, It's listed on the osmocom.org wiki but has no details page, so I might guess that not. - It could be you to be the first to try it! :-)

k/