A buddy of mine active on HF bought a Josh Tudor sub. It wasn't perfect, but for $128 it was a great base to start. It also accepts gen parts. There's a thread in the Oyster Homage section on Homage Forum if you want to check it out. He dropped a gen insert into it. Looks pretty good. I think its still on the first page of Oysters. Might be second though.
thats what ive been finding, think i did stumble across a couple of your builds for the montecarlo it was either searching or while lurking the chatbox