Fiberglass thickness

When I've been doing all these upgrades, I've saved the remains from the drilling holes to the fiberglass. This is the final overview and its average thickness:

A. transom (plywood reinforced, fuel hose to the outboard motor) - 25mm
B. hull (thru-hull depth sounder) - 11mm
C. deck (cockpit, depth display) - 5mm
D. inner skin (depth display) - 3mm
E. cabin seating (inspection hole) - 4mm