John,I built mine out of 3/4" birch plywood and finished them with a Tried & True oil finish, as birch doesn't stain well. They sound great and look real good. You can spend as much or as little time on the boxes as you want.
If you're going to use these in your office, you may be able to get something like MDF or particle board (the fine stuff, not the chip board) and then paint it instead of veneer, put some stickers on it, and be good to go.
These sound great with Paramours- lots of bass and excellent dynamics, and you cannot beat the price!
Matts