Bob and Mattak: Thanks for the compliments.

I put a lot of time and effort into the sub and I'm very pleased with the results.
The veneer I used on it was like a 1/8" plywood sheet with one side finished. I have some left over and would love to use that, but there's no way to get the rigid stuff to work on a bookshelf speaker (especially since the front baffle has a round over).
I've also heard finishing raw MDF is a PITA. I'm pretty certain I'll go with veneering the speakers as I build them.
I've been wiped out with the flu last two days, but I hope to get things started before the end of the week.