Tone is in the wood, not the thickness of the wood.
Custom shop LP's are lighter than non chambered LP's, because they use better quality tone woods. CS LP's weigh in around what a chambered LP Standard comes in at. That shoud tell you something about wood thickness vs tone.
you got it all backwards. they chamber lp's so they don't weigh as much as the vintage solid mahogony one's like the 8lbs.-10lbs. customs.