Sandwiching is normally no good for bodies. It kills resonance.
nah. i have done a few sandwiched bodies and it definatly does not make a guitar non-resonant. obviously it changes resonance but that doesnt have to be negative. i t can allow you to control the resonance
anyway, i made my first fanned fret guitar with reclaimed mahogany from old book shelves. all 1" thick
3 pieces for the neck through, then the body wings were a sandwich of 1" mahogany, 1/4" maple in the middle and 1/2" of quilted redwood on top

even with the other bits i still only payed about £30 for wood to make the whole guitar.