cool! have you test-fitted the carboys/buckets yet?
My only critique is that I don't see supports for the "shelf" on the right(and probably left, but I can't see it from the angle) and that would make me wonder if it's sturdy enough to handle about 100+ lbs (if using two glass carboys; ~70-80 if buckets/BBs) of weight. Just a thought! Looks good! building one too!