Click vinyl flooring
Would NOT recommend. It was a pain and has definitely shifted/popped up in spots. If we did it again we’d use a single piece of sheet vinyl.
Aluminized styrofoam; 2 sheets required. Home depot vinyl roll $50, oem plywood underneath (not fastened to anything), rivet holes in floor epoxied and caulked, fuel lift pump access door. Details in YouTube video below.