I only have guitars but I won't waste bandwidth with posting each one. However, 3.7kg has been a common figure throughout the range. Purely by coincidence, not design.

My PBG TLA-1 weighs in as the heaviest at 3.8kg, and the lightest is my Strat-configured Tele hybrid coming in at a ridiculous 2.9kg (basswood).

I do feel that right around that 3.5-3.7 mark is perfect for me.