Most guys make a PVC or wood frame that can be dissembled every year and stored away. If its PVC I have seen guys glue all but a few fittings so you dont loose pieces. Wood 2X3's or strapping is easy disassembled with stainless screws. After the frame is built, protect the corners of the wood with rags or sponges and then have a shrink wrap guy come by and put a door in so you can work in it in the winter with a space heater! The big trick is to make the sides as steep as you can get them so the wet snow rolls off.
My 'club house' last winter. I left the back open to get materials in there.
