F-40s are larger than F-30s...Remember the width at lower bout is 15"1/4 on F-30s and 16" on the original F-40s... (Al complains they are now 17" - like F-50s if I got it right)...(...)
OH WAIT!! I remember why I'm here.... I'd love a maple F40 (I don't get the nomenclature because what's the diff between F40 or F30?? I don't understand ANY if it!!) so if they came out with one, kinda like Al says, with a medium or even deep guitar, with a short scale and also a Venitian cutaway!! I love those! Guild did it so good!! (...)
For smaller sizes look for F-20s (there was a real nice one for sale here not long ago, maybe still available)...I think they are not currently built by Guild right now like the F-30s as well...