You may want to consider another option. I moved into my airpark home last year and am now doing all the prep work for my future hanger.
I plan on building my own air conditioned hanger with ICF blocks and using steel paneled SIP's for the roof. The plus is 250mph R-50 walls and R-30 roof with minimal trussing. It also makes it easier to do a majority of the work myself. I only have to make my slab 4-6 inches since the walls sit on footings, saving concrete. Plus the ICF walls are the form for the slab. I will be using Nudura ICF and Structall snap-n-lock panels for the roof. The roof panels will be 4x24, span an unsupported distance of 25ft and easily installed by 3 people. Here is a rough cost breakdown on how my projected costs are today.
For 40x42x12 hanger with 3-12 pitch.
$5500 for ICF blocks
$1500 for steel rebar and concrete for said blocks
$4000 for footings and slab ($3000 concrete and supplies + $1000 hired finish work)
$8000 for roof
$7000 for hydro-swing door
This cost is less than my neighbors hanger plus slab, not to mention the $18,000 he paid for a crew to erect it.
Don't get me wrong, "turnkey" is great, but I tend to want the best for the least. Wait a minute, that's why I am building an RV!
