We did get the back on and the amps temporarily mounted for some testing. Still waiting on my alternator (though the new primary battery did arrive today).
I think I missed the mark on tuning by a fair bit. I can play down to 26 without unloading (I don't have any lower test tones). I'm leaving an awful lot on the table as far as the meter goes by tuning so low and I definitely want a proper alternator in before I try to push things.
I'm probably going to roll with it as is for a week or so and see what I think then perhaps try to carve out the port to tune higher.