@Esse, I've looked into it a little bit. It seems those flute chambers are for the voicing of the guitar. Not sure how that works but I am willing to do that solely for the benefit of weight relief.
medyo technical, but i'm sure that you'll understand and appreciate this.
the "tuning" chambers are governed by wavelength re-enforcement principles. a frequency is re-enforced at its own wavelength, or at 1/4 its wavelength. so let's say you want to emphasize resonance at a certain note, what you do is get the wavelength of that note, and carve-out a chamber equal to that wavelength
or 1/4 of that same wavelength. the chamber does not have to be a straight line... it can be curved.
think of those large pipe organs. the large pipes are tuned based on the same principles. but for practicality purposes, small instruments have to use the 1/4 wave principle. the cool part of knowing this principle is that you quickly realize that wood/material selection is not the only means of mechanically tuning an instrument's resonance... you can now leverage wavelengths.
I know this because I used to experiment making speaker boxes based on 1/4 wavelength transmission line designs.
ex:
A440Hz has a wavelength of 78.41cm. if you want to create resonance at that frequency, either create a chamber with a length of 78.41cm, or 19.6cm (1/4 its value).
now the trick here is that you have to choose the frequencies you want to re-enforce. I guess a good starting point is to re-enforce frequencies at the "presence" region of 1000-5000Hz, so that the guitar will sound "lively".
here is a mapping for frequencies to wavelengths for reference purposes:
http://www.phy.mtu.edu/~suits/notefreqs.htmlI hope this helps.
