New drop down build

[Icykillshot]

Hey guys I am starting my drop down ice house frame in 2 weeks and wanted to pick brains on materials and anything new I can throw at it! So plan is 8x14 drop frame with 4ft v. So far I know I am using metal studs to save weight, and using some red wood rafters from an old mobile home so it will have a nice curve for the roof. Still rolling ideas around weather to shingle/rubber/metal the roof...still undecided on ext wall covering, int wall covering. Started a plan with energized outdoors for power so should be set there.  But any tid bits of knowledge please send them my way!
Also still trying to figure out a door plan for this shack, wanted to do double door on side for ATV but not sure the doors seal very well.