At some point I will need to replace at least a section of the OSB floor at the rear of a 2003 Scamp 13.

Anyone ever use HDPE sheets for this?

Is there any site that has a process for adhering it to the camper shell?  The tab or plat around the bottom om the shell appears to be quite flimsy. Would I just use sections of fiberglass above and below the floor to adhere the shell to floor in that area?