Don't forget that pit in the new barn.

Lessons learned the hard way....arrange the doors and access so every vehicle has its own door and can be moved in or out without having to move another vehicle. In addition to making it big enough, make it tall enough.

Put electric outlets everywhere. If you do not have internal posts, drop them from the ceiling. Ditto with air lines.

If you have better lighting than the average hospital has in its surgeries, you almost have enough.

For the bus and the Airstreams... nothing is as nice as having water connections nearby, RV electrical connections up to 50 amp, and sewer connections. Priceless.