[Bob Carriere]

You can actually skin it twice...once on top once inside..... keep the space in between inflated with a small blower.... instant insulated green house.....

Unless you use pressure treated plywood it eventualy rots and fails.... for our purpose with proper ventilation...single skin it would work.... so would a pole barn construction..... rigid frame.... sheet metal roof and canvass siding...

What it really boils down to is do you spend $3000 for a very secure 8x8x20sea container that you can use as soon as it hits the gravel bed.... estimated life.......25 years.... or $1000 for a rugged 10x7x20 HD canvass shelter that requires 8 hours to set up good for 10 years....... or a $500 do it from scratch project that will consume 3 weekends and last 5 to 10 years.... the big cost is quality UV resistant covering.....

Frankly at my age, with all due respect to practicality, if I can get a middle of the ground solution for 10 years with minimum efforts to set up and to maintain....... $1000 for ten years is $100 a year.... after that my needs to shelter a wheel chair will be minimum.....

I found this Canadian company from NB....Cover tech...... looks promising....

There may be others....but bottom line is that for a quality 7x12x20 average costs is about $1000..... if it will last 10 + years....ain't so bad.

Boob