And I don't really see what stud walls has to do with lifting floorboards. If the board goes under the stud wall, you just cut it on a joist line.
It doesn't, just stud wall may be in the vicinity of the shower light in the main bathroom; although that 50w SMPS I can easily pull down. I could get to the 150w SMPS, just would mean moving loads of heavy stuff in the loft to get the floor boards up.