Sorry Sky,I've been back East and doing tractor work on my property and missed your post.
I kinda fell into a good deal...a neighbor just happened to have barn door track and trolleys off an old barn and gave it to me along with some wooden frame door parts. I've re-engineered the whole thing and will end up with something like a cross between the Tite Stack and Horton door only I'm building it out of 1" x 3" 0.065 rectangle steel welded together into 12' high and 4' wide panels. I went with that size to reduce waste and simplify construction as well as having the 3" of foam insulation to keep the shop warm.
My door will face South and I'm going with a 2" x 6" stud walls with a full below frost line foundation so there shouldn't be an frost heaves to worry about. Interestingly, that construction on the walls was only $4K more than a pole building and will give me a tight and well insulated building that should cut down on heating/cooling costs. Concrete was about $10K more for the poured foundation but that should provide a very stable foundation. Now if I can just get my wife to make up my mind on which of 3 options for location of the shop/hanger I'll get moving out on permits and get started.
One of my neighbors has a two piece fold up door and his faces North and he had to cut the concrete and put in heating wires to deal with ice in the winter. Those with South facing doors seem to be pretty much worry free. I'm toying with the propane hydronic heat augmented with solar panels but I'm not sure I have enough direct sun in the winter due to trees on either side. WIth evergreens it's either shade in the summer and winter or cut the trees and deal with the heat in the summer. Lots of folks here use propane fired radiant heat mounted on the walls near the ceiling but if you're working under a wing it's cold there...that's the beauty of the floor hydronic heat and your feet are always warm.
Any other thoughts or ideas for heat?