How would you attach a plywood camper floor to a steel frame?

I am in the planning stage of a small teardrop camper. I want to work out as many of the details as possible before actually building it. So far my biggest concern is attaching the camper body to the steel frame. The floor is going to be built with plywood with a fibergl/epoxy outer skin. What would be the best fasteners? Would you want an adhesive and/or cushion between the frame and floor? How much would the floor need reinforced at the attachment points?