hi, i am currently knee deep into a repair job on my old 97 Elddis Typhoon EX300. The rear end has suffered bad water ingress....(i'm guessing before i purchased last year) I could do with some help as to where i can buy the 22-23mm thick wood lengths, the polystyrene, and either the 3mm ply, or papered wall boards. What glue to use to stick the polystyrene to the caravan wall, and then the ply to the polystyrene, what the standard paper is called in the EX300 etc etc.... here are a few pics, of my progress so far......PLEASE FEEL FREE to tell me where i am going wrong etc.