I've hunted out of several designs and these are my observations.
Do not use tin (like that of pole buildings) unless you line the inside with plywood. The tin is very noisy if you bump into it at all.
Use some type of thick carpet on the floor for sound insulation.
Hinged windows seem to work better than sliding windows (noisy).
Dont make the window openings too tall, 8" is usually plenty. Too big exposes too much movement.
I dont think insulation is all that necessary. Yesterday it was 17 degrees outside and 42 degrees inside my uninsulated blind. The sun seems to heat it up well and insulation might actually hamper that. I have a heater in it and never use it. When I do it seems to cause the widows to fog up anyway.
Install several padded shelves.
4'x6' is a minimum size for even one person IMO. I built my first one 4'x5' and thats a little cramped, easy to bump the sides and make noise when turning around. Does not leave much floor space for your pack, heater, etc, either.
Keep your eye out for some discarded swivel office chairs. Much better than lawn chairs when you need to spin around quick for a shot out the back.
Some type of shutters for the off season will prolong its life by keeping out the weather better.
Glass windows will not scratch up like plexiglass does.
If you dont set the legs in the ground, you can pick up large ground anchors (like dog chain anchors only larger) and secure them with cable and turnbuckles to keep the thing upright in the wind.
Stock it with Playboys for slow days!
I hope some of that is useful to somebody...