I agree on the in-floor heat if possible, tube heater 2nd choice. In AL the tube heater might be a good compromise, heats objects well, quiet doesn't require a boiler. With sealed combustion chamber and outside combustion air, relatively safe with combustible vapors. Definitely a floor drain. In my 1300 sq ft garage I have 7 - 4ft 2 tube electronic ballast high color temp tube fixtures plus 4 smaller fixtures for "walk through" vs "working" lighting discourages the wife and kids from leaving the main lighting on if it's switched in an inconvenient location. If the ceiling is bright white I have found the fixtures without a reflector actually bounce light better. That level of lighting has been good, I wouldn't do less. True electronic ballasts (I have Workhorse) don't pulse, are quiet (no hum) and more efficient. The high temp high CRI tubes (T8) are much nicer for working in, not "cool white" mine are above "daylight". I have one of the large industrial bladed ceiling fan for cooling and it moves air well but an actual cooler would be better. Plan ahead for outlets both 110 and 220, too many is not enough. I ran the basic wiring in the walls and the 220 and additional outlets in conduit surface mounted for future expansion. A good 2 stage compressor is a must, quieter is nice mine is 80 gallon 5hp 220v 17 CFM @ 175 psi and has worked well for everything I have needed. Plan your air lines to allow condensation to drain out at low spots. I had a copper cooler built that was extremely effective in a previous install. The water separator after was always dry. Upper cabinets everywhere allows storage on the walls but keeps the space below to store MIG, TIG, Plasma, torch, saws, brake, etc. HTH