[arcticdude]

Unless you pack it tight, I'll bet you'll find a 65x70 won't be big enough. My 40x60 has the bird, a couple of tractors, one truck and my enclosed trailer. The tractors, truck and trailer essentially take up the space of the bird (a little more, but not a lot), so it's like having 2 coaches in the space. I can walk around bird, but don't have any real extra room. So adding storage and office and bathroom and a lift will quickly tighten up the extra space. If I can swing it, my next bus barn will be 80x100 with probably a covered parking area down one side.

So unless you're planning on parking a coach in/on the lift space, you may want to go bigger. Anybody passing thru the OKC area is welcome to stop and see my current space for size evaluation.

I also had custom trusses down on a 16' sidewall, so I can relatively easily walk the roof without having to do a gymnastics routine! The standard insulation also works very well to moderate the internal building temperature.