Single wall permittable? Yes! Glass required?

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If no approved plan, draw up your own at 1/4 inch per foot as scale for floor plans, 1 inch per foot for details, and 1/8 per foot for plot plan for easy acceptance to the Building Department. I like to use a four foot grid system, as dimensional lumber comes in even increments, and ply/drywall comes in 4 ft and at 8 ft increments. Eichler did this in the 50's and saved bunches on material and labor costs in his subdivisions.

Obviously drywall will not come into play here, but for siding material it all works out with very minimal cuts.
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Edit for drywall comment