WOT
Banned
Fiberglass not necessary, that wood is probably stronger than mdf and you can tell he is doing nice joints and gluing properly. A bead of silicon around the interior edges never hurt anybody to ensure an air seal thoughLooks like a very nice build, but I still would not have chosen that wood regardless of budget. I think it'll be fine, but I would resin and fiberglass the inside of that box heavily.
