Time will tell. It has not been my best effort. I've made half a dozen PVC/visqueen houses over the years of boatbuilding. This one started out as just a center cover but somehow grew. In the end I had to add some gusseted frames to the the original center section.

Here's one built of PCV with ply ends which held up under snow load despite other's buildings which failed. The PCV was 1" with 6 mil visqueen battened to the 4X4 base, construction string tied snugly between the PCV uprights to prevent flapping in the breeze. This was when I build Passage. The wooden ends were for "security" and to keep the breeze out.