How's this for minimalist?
I started my stage 22" from the wall, and only filled it with pink fluffy. I plan on a shorter "stage" behind it that I'll fill with sand for the speakers.
I used a 2x4 nailed to the back of the stage and screwed/nailed into the ceiling with a 2x3 crosspiece. I don't have a picture, but then I sistered a second 2x4 against the others, under the crosspiece and on the stage.
With screen-washers and sconces: