Steve, have you thought about finding, or making, a compatable OB bass driver such that OB builders could make a "poor man's"
Lotus Granada? That thing has gotten rave reviews but the price is just absolutely STUPID!
I bet you could make something that approaches at least 95% of the sound with a real world price. Better yet would be if you designed an OB specifically for a driver array like that - two bass drivers and one FRX per.
I know your existing
ZOB OB design prob sounds great too. I was just thinking that a more standard baffle with more drivers would be an easier build for DIY but with sufficient bass? Dunno, it's just an idea.