Well, let's see. Based on all that we learned building our new shop...

1) More electrical outlets. In more places. And everywhere that you're thinking of putting any, double the amount you're planning on. No plugs on the floor (see #3), put them on the ceiling instead and get cord reels.

2) Washer, dryer, and utility sink with hot and cold water. If there's space, a dishwasher, get a portable one that can hook to the sink. Never use it for dishes, but for tools and parts.

3) Build it so that it can be hosed out. Preferably at least a couple feet up the wall.

4) Skylights. Can't say enough about these. Most days we don't even turn the lights on.

5) I'd try the stained concrete, the epoxy isn't holding up in the high use areas.

6) Two post lift. The type with positionable arms, not the drive on ramps. Takes up less space and is more versatile.

I'm sure there are more thoughts, but those came to mind quickly.

MV