Well I have finished my box. All the cuts were within a 16th of an inch of what they were supposed to be. No 1/4" gaps like I got when Home Depot person cut it. Ports are in, bracing is in, t-nuts are in, caulk and glue is drying now.
This is the first time I've:
Cut wood myself
Actually used screws instead of waiting an hour for each panel to dry. Countersink drill bit too.
Made a ported box
Cut PVC
Used t-nuts
Used caulk
Used the Jasper circle jig and a router
Used bracing
So many first time things this weekend! I must say I'm a little burnt out... I'm not making another box for a while but I'm sure when I make another box it will be much faster/easier.
And no, this box is not perfect. The cuts could be better. And when I cut the PVC I cut it a little slanted. And even though I predrilled, the wood still split on the corners on the sides. And the inside of my box looks like a 10 person bukkake. But I feel a lot more comfortable building boxes now.