Several problems with this idea:
Mylar is a thin, fragile material with very little tensile strength. As mentioned, the slightest rip and it completely shreds.
Thin, light materials flap in the wind. Plastic will fatigue at any connection joint where there is vibration. Then it will rip and turn into shreds.
Inflatible objects tend to adopt a spherical shape unless fitted with internal gussets like an air mattress. Not what you are going for here.
Air mattresses, designed for being durable with loads on them, are made out of heavy, fabric reinforced vinyl, not mylar.
I think a better idea would be a tent-like structure made out of convertible top fabric.
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