Hector, my barn is 30 x 50. I like that you went 60. It looks as if you are designing it to work on your bus evertime it's in the barn, which will not be the case. I would make the door big enough to back the bus along one side when just parking and then you'll have enough room to park other STUFF in there.

If you use Jon's style of building with two doors, I would add a pit. I use stands and get along great without one.

Keep in mind, your not going to service our bus's too! I don't think.