Floor strength MRH90
The Huey has a quite strong floor, but is still susceptible to denting/piercing by sharpish and heavy metal objects, like mortar baseplates, etcetera. This was remedied in the early days of RAAF Iroquois ops by manufacturing a plywood overlay (also a load-spreader) with cut-outs for all the floor tie-down and other attachment points. It was secured to the floor with just a few screws and easily removed to hose out the cabin when contaminated by highly corrosive body fluids (blood, etcetera). Maybe that would also work on other types!