It would be free standing, maybe a gambrel roof.
On the sides would be large windows with contrasting trim. Board and batten siding, sealed with penofin. On the side facing me would be a large entrance door. Facing the driveway, a very large door on barn like rollers.
Heat and bathroom with a shower. Bathroom would have Corian countertop, shower will be tiled.
Ceiling fans, and wood stove to save on heating oil.
Outlets every 4 feet, 240 outlets every 10 feet.
10 foot high ceilings, cement floor with wide board floors.
Steel roof, probably red or green.
Upstairs storage
Insulated for winter. All windows allow cross ventilation during summer.
Area specific for car/equipment repairs and metal work. floor drains in car area
Walls painted with cream colored eggshell, ceilings off white.
I like the Gambrel roof. It would be neat to be similar to a barn. Have the one short side ground level with an insulated overhead door and the other buried so you could drive in the top of the building with a set of forks for stalking lumber and parking the portable mill, SUV, snow blower, lawn mower and a few dozen other things. Of coarse, both steps and utility elevator from shop to storage. A few large windows for light and window shopping. Field and pond in one view, woods and saphouse in the other. And them those other things you said too.