With much help from people here, and especially lilmike, I have come up with a design that I will implement in a pair for a friend. I am sure you can see the similarity with lilmike's F20 Build will be in this thread. Speaker used for the build is the Dayton DCS205-4. It can also be build wider and dual loaded with DCS205-4's.
Corner loaded it should give me something decent in the 30hz region. Design ended up a bit shorter to fit in the box, which took about 1db away according to hornresp.
Overall the box adds up to just under 8cubic feet, dimensions approximate to 49"x17"x16" - However the width of the cab is pretty liberal, you can go down to about 13" wide without losing too much.. Or as much as 21" wide and get a slight bump in bass extention..
Ok, here it is refolded to use the entire volume of the enclosure... a few db here and there, no big changes - but a big difference in simplicity / ease of build. The previous horn is in grey, the newly refolded one is in black on hornresp pic.
Ok, so after showing the plans to the guy, we had a discussion and this is the result:
3 tiny cubic feet!! This is pretty small, and the output should still be pretty smooth for an 8" speaker. Hope he likes it, and I am very curious of what will end up happening here.. Im going to get REW, just dont know what to do for a mic?