Hugomack
Experienced
He is making it a sealed vertical 212 guitar cab.
Yep - I can see that.
So here's the much longer version of my question: Just as the earlier suggestion of a slanted baffle made great sense, so might porting (this being for an Axe...). Both possibilities could have incorporated with relative ease - but maybe not with this prototype.
I'm not seeking to blow off this idea in any way. But it has been posted since design stage for comment, so I'm commenting.
I think the other earlier idea of splitting this into lighter units was also good. Personally, I'm going for much lighter modules, rather than one big heavy one - as with modern PA's.
But the cabinet making is of very high quality and it will be interesting to see the finished article. Please regard my comments as intended to help the OP with his market research (as he's said he's thinking of going into production.)