Great work with the build. For some reason, I'm not seeing the port in your pictures. Looks like your mids/highs might actually overpower the bass; never even thought that could happen before with a build of 16 12s! lol Should be amazingly loud and clear.
Love these big builds. Keep it up man. Love seeing these multi woofer setups reminiscent of the old days. Someday I will have the cash and time to do something like this