Architect of the 1986 Shelters for Roman Archaeological Site (3 structures) architect Peter Zumthor won the 2009 Pritzker Architecture Award. In archaeology we have had pretty good success working under greenhouses for plants, one 25' we put wheels on to move. Assembled with a double layer some can be inflated and act as a barrier to the elements. I've seen on some archaeology sites custom structures and trusses of PVC for example with greenhouse plastic (UV blocking?) stretched over them. I had often worked in winter thereby and construction schedules, mostly unimpeded resulted. U-Haul used to rent toboggans. Safety First!