A separate "dirty area" for taking projects/parts vehicles apart.
You can never have too much space.
Running water.
You can never have too much space or too much light. Incorporate some windows near the roofline (no keep out prying eyes and eliminate easy access) for natural light.
Outside wood furnace (radiant floor heating if the budget allows).
You can never have too much space.
Design the electrical service so the 220 items can be installed near the box... but big compressors are loud.
Did I mention that you can never have too much space?
1967 & 1968 M715
The ChopTop