Yeah, good thing JP Jones and Jaco weren't acoustical engineers.
OTOH the advantage to using paper (or a screen) to first determine how a cab will work before building it for real saves a lot of plywood. BTW, the 360 was an almost exact copy of the JBL Keele W horn, a late version shown here:
http://http://www.geocities.com/loudspeakerguru/Keele_W_Box.doc
It was intended as a bass bin to be used with a separate midrange cab handling above 300 Hz; Acoustic left the mid cab out. Any knowledgeable acoustical engineer would take one look at the response charts and conclude in ten seconds or less that without a separate midrange cab it would be weak in the mids, and that on a typical stage room interactions could make it very difficult to hear up close, while further away it could be overwhelming in the low end.