I was told by a carpenter that he did not think the treated ply would stand up to rain, even when treated, but if covered with grp sheets (pics below) , attractive wood effect would still be seen, but protected .
Grp sheets could be added to walls for a "green house wall" with shelves or trellis as shown in previous prototypes
Mk. 3- 4 Prototype Frame for a Shelter with Green House Walls for Containing Veg or Plants or Garden Office / Shed with Shelves
Building an "Insulated Wall Greenhouse" to make a trailer more attractive & insulate its' contents
Grp Sheet Green House or Storage Shed Prototype with Frame on the Outside to Form a Trellis to Suppot Creeping Vines or Beans etc