4.5-5lbs would be very light indeed so it's more likely to be kg. But that will be the shipping weight and the packaging will contribute some weight to the overall figure. Ash can be very dense indeed unless it's grown in proper swamp ash conditions. Also, individual bodies will probably vary significantly in weight, so you could always ask Adam to sort you out the lightest GTL kit they have.
Yep, 4.5-5kg. The GTL and GST kits are much heavier than the TLA and STA kits.
Cheers,
Adam
adamboyle(at)pitbullguitars.com