Hello Tim and thank you for the input. I suppose the best way to make the lower enclosure is to make a box and then add top and bottom boards made of veneered plywood Hardwood. I was thinking that veneering that strange shape would be tough. I suppose you are right that the midrange cabinet would be tough to build and I may consider having Wayne make me a set. However, I do like a good challenge as well! I wonder if the type of 15" drive is less important in the three way system since the lower driver does not have to cover as much range. Maybe it would be more important to buy the JBL in the two way base reflex designs? Have you ever heard a JBL driver?
Cheers,