Not that I want to start an internal war but IMHO the FG360s were better spec and sound than the 180s - which is why I have been hunting for a 360, and I got it for a good price...

Yep, the bottom bout is BIG. 16 1/4 inches on the 360s I've seen - but some seem to be fan-strutted and some X-braced. I'm waiting for info back from Yamaha on that.