Good afternoon and happy holidays. I've been kicking around the idea of a fully horn loaded 3 way garage system. From looking through the vintage stuff on the jblpro site I like the look of the 5671 cinema setup. I'd like to change it up a bit based on a few drivers I have laying around.

HF section wpould be a 2426H on a DIY tractrix horn, 800 Hz flare cutoff, with the HF coming in around 1600 Hz. MF section is a 2123 or M209-8A on a DIY tractrix horn, 175 Hz flare cutoff. The MF driver (whichever I and you help guide towards) would run from say 350 - 1600 Hz. LF ideally would be a 60Hz DIY Tractrix horn running up to 350Hz. The horn's length is about 25" with a 12" x 12" throat. I don't see the throat as the problem so much as the mouth. Plots have it coming in at 55" wide by 35" high (rough numbers). Making bending forms for that horn flare will take a bit of work. I don't have any LF drivers now that I want to use but initial thoughts are Altec 515-8G. The horn mouth could go up to a 15" x 15" throat and run 2245s as the LF horn drivers. Going up to an 18" driver reduces my LF horn length, no relief on the mouth.

How far off target am I with this and what are the possible pitfalls in building besides LF horn size?

Thanks in advance, Gary