Unless you are limited by the acreage of your site or setbacks or something, I see no purpose of going 'up' with a loft or something like that. My advice is to go horizontal - not vertical for these reasons:
1. You won't want to climb stairs in 20 years (or 50 years).
2. Loft trusses are more expensive
3. In this part of the country, it would be 120 degrees up there in the summer.
4. Anything can go on the floor of your shop. Only light weight things and seldom-used things can go in a loft
Probably more reasons against, but I can't think of any.
I notice that you opted for the (expensive) backhoe on your Mahindra. Did you mull it over carefully before deciding to spend that extra cash? Do you regret it? Doubt it. Only hurts once - when you write the check!
One thing I did that helped me decide on size and layout was to use Excel to make a scale model of the proposed building and scale models of it's contents. Camper, equipment trailer, pickup, dirt bikes, tractors, etc. Then, just move things around and see what fits. Will the log splitter fit behind the camper? Better to find out with a scale model than to have it sitting out in the rain when your new building is too small. And, by the way, I now have tons of stuff that wasn't in the original layout. Fortunately, I left some extra room.
