Truly impressive work. I did the same kind of project with a different design and I'm impressed by your veneer work!
A somewhat off-topic question: does anyone else have any concerns about the effects of the immense pounding from a powerful sub on an interior plate amp or crossover? I mean, we accept that we need substantial bracing to deal with cabinet wall flex, but doesn't that same incessant beating do anything to caps and other components over the long term? Just asking, because I've done exactly the same thing...