-Wider because of doors and jack handles. Every foot counts.
-Consider putting frosting film on the windows and then you can not worry about blocking them, seeing as you need them architecturally.
-Every window is $500 or more, where the wood and siding and insulation are far less. Spend the $ on sq footage.
-Cabinets instead of shelves. SO much neater and easier to clean. Ikea has cheap but actually nice ones if $$ is an issue.
-Compressor in the attic, Make a room around it, insulate with Rockul around and below. you'll thank me from the bottom of your ears
-Plumb the compressor down to a hose reel or two.
-Outlets: Quads not duplexes. Run TWO circuits to each quad box. Use white and grey outlets to denote which circuit they are on. 20A of course.
-Think about what you like to do in the shop. Plan around that.
-Can't have enough counter/bench space.
-I like stainless boxes under counters for tool storage that is mostly permanent, and a rolling tall box that goes to the car I'm working on. More efficient.
-A devoted space to organized nut and bolt storage.
-A real closet for engine hoists and jacks and brooms and oil drain cans and all the large stuff that you don't want shoved here and there. It's an eyesore.
- Wire for sound.
- Hang a flatscreen at one end.
-If you like being out there, maybe do a 5.1 surround system for F1 etc.
-Since fl 2 is storage, maybe a dumbwaiter (Or just a section of floor that lowers on a pulley system) that can be lowered helps heavy parts go upstairs .
-Plumbing might be a zoning no no, but if possible, yes, a bathroom/
Random thoughts