Don't know if it will help at all, but the door is the only thing I can answer on. I have a 35'X50' with 14' walls. I was able to do a 14' door, but had to do a slightly steeper pitch. The door is a 14x14 centered on the 35' wall, just had to do a 3/12 pitch instead of the "standard 1/12 or 2/12.