Hey Rod, I don't know if heating your shop will be needed, but if so, I have a heated floor in my shop, and it is by far the best way for comfort in a work area. Hot water heated, cheap to install and maintain.
Next is to plumb the shop for air. Just use 3/4" or 1" pvc water pipe like in your house. It is rated for more pressure than most people run in their air compressors and at much higher temps. Just roughen up each glue joint with sandpaper before gluing. Many shops around here have had this system in use for ten plus years. Much easier than threaded pipe to install. Build a soundproofed box for your air compressor. Put an air outlet at each outside door, you won't have to pull a vehicle inside to air up a tire.
Make sure you install LOTS of electric outlets, including a 220V one at each outside door. You won't believe how often you need to weld something outside the shop.
A good alarm system is nice or a pair of rotwielers or dobermans will also do. Or hire a guard. Or lease your land to Sherif Deputies for hunting in exchange for guard duties.
I used an above-ground hoist, they are very nice, but make sure you get one that is pretty wide between the posts, mine is a bit tight with my truck.
I put a loft in two corners, each with storage above, one as the roof over the machine shop, the other as the roof over the paint room, just drop tarps from the loft to make the paint booth walls, install a fan in the window. I have 16' ceilings
If you don't put piping in the floor for heat, then use a concrete saw for the expansion joint lines, jacks and rollers go over these saw cuts much easier than the troweled in joints. Easier to keep the floor clean too.
Bury 3. 5" ID steel tubes in the floor and make stands for your grinder, anvil and monster vice from 3" [about 3. 4" OD] heavy wall tubing. Just drop the stand into the socket in the floor when you need the anvil, vice or whatever. Then pull up and store them out of the way when not in use. Keeps the workbench tops clear.
I also burried steel 3" pipes in the floor with a 3/8" thick plate welded over the top, flush with the floor surface. I cut an 'X' in the top plate with a torch, with the cuts about 3/8" wide, this is to drop a chain into, and hook a winch to the chain to drag around heavy stuff when you are alone. Also can be used to do minor frame straightening.
Email me for photos if you want, at: -- email address removed --
PS: even 70'x80' will be too small sooner than you think!! I wish mine was double that size.
Floor drains with screens or grills are a must if you want to wash your truck inside.
Greg L. The Noise Nazi