I've built dozens of "shops", mostly industrial and manufacturing, machining, automobile repair, woodworking. As an electrician I've also wired home owner shops. If you build a new shop consider the following: Good Lighting would likely be # one on the list. In my personal shop 14 X 33, I have (4) 250 Watt Metal halides on the ceiling, (4) 8' flourescents on the walls down low,about 16" off the floor, some florescents on the walls, just above head height, and a couple of incandescents. The Incandescents are on a switch so that if I just need a tool or jack from the shop I don't have to turn on the whole light system. If I poured a new floor I would consider putting 8' florescents in the slab in a "Leave out" that was trimmed in angle iron and covered with a piece of 3/4 " Lexan so that the Lexan was flush with the floor. It's tough enough to roll a floor jack on to and jack up a 5 ton truck. If you are going to be painting good light is essential. This completely eliminates the need for a drop light.>
Plenty of Outlets for both Power and Air. Having cords and air lines under foot is a nusiance and a trip hazard. I've plumbed in the Air system in several shops with PVC. It's cheap and fast. You can even bury it in the slab if you think ahead when your building. Most of the big plants and commercial shops we piped the air in in black iron or galvanized.In my current shop I have Air outlets on both sides with whips long enough to reach the opposite corners so that you can use 2 tools simulteanously with out having to un plug. Likewise I have short heavy duty cords on both sides. They all live on Cheapo Garden hose holders from Walmart or Home Depot.
There is nothing like having an overhead bridge crane. It doesn't have to be very big, most Cat Equipment dealers use a 3 ton. A single mechanic can completely tear down and reassemble a D11(fairly large machine) with only a 3 ton.
Some type of Forklift is kind of the runner up to a Bridge crane.
Build a seperate place to Grind, Weld, that sort of stuff. It will keep the grit out of your projects.
Don't store anything but Tools in your shop if possible. Having a big clutter impeeds every task and materials such as hardware and parts don't care weather it's cold or warm. Put materials in a Connex, or old truck body. You can pick one up cheap, build shelves in it, add a PERMANENT light, and if you want it to look good you can side it with T111 and even put a small peaked roof on it to disguise it. the Peaked roof is a great place to store long stuff like pipe and lumber. >
If you buy a 4 X 8 Sheet of inch and a quarter plywood, slice it in half lengthwise, so that you have (2) 2 X 8 pieces. Now attach an 8' 2X4 to the wall at table height(whatever height you like your workbench at). Make 2 4X4 legs for the front, attach them with the biggest "T" shaped barn door hinges for the front, and put 3 standard door hinges on the back. This Fold up work bench is strong enough to stand on or place something weighing in at 3 or 4 hundred pounds.
I'll think up some more stuff but for now that's enough.
Include pictures. 
