ive never built an ice shack before....but ....do you think it might be wise to clad the bottom foot of the exterior plywood to keep it from delaminating with aluminium because when it is being towed out to site...im sure it going to get wet....does the bottom of the door have a treatment to it of some sort to stop it from swelling when the door is closed and sitting in snow or a puddle thats going to be inevitable from tracking it in...
im just thinking out loud....keep up the good work
edit to add..im sure even aluminum facia(6 inch) installed upside down would offer adequate propection but it would have to be caulked on the top