Zedder:
I am glad to see you are utilizing an architect, as this is my profession. I assume your classic cars that you have or will have will not need much work performed on them. The 22'x40' garage size you described earlier is going to be very tight. My parent's garage is of same width, but with side approach to two separate 8 foot wide doors along drive it does not work well.
My 2 cents on this subject would be to make sure the garage had the following:
1. A single garage door for both bays at least 16 feet wide.
2. No interior support posts down middle between car bays. (Again my parent's garage has this due to the garage being part of the basement and there are 2 floors atop it. Single framing members across garage width can be done, but are tyically deeper and thus more expensive.)
3. Tape off a 40'x22' space on concrete and place 4 cars within this area and walk it to determine if this is a space you can be happy with. I do not see you having hardly any workbench/tool space once 4 cars are in-place.
4. You said you were going to have a car lift at rear bay. Make sure you have the height clearance and concrete slab has been designed for this increase loading at car lift attachment points. Also, when considering height clearance remember to take into account in suspended piping or HVAC ductwork.
Well I know I said a lot, but I always try to tell my clients that I am not a mind reader but a problem solver if I trully know the building problem. Try to think through what minimum features/capabilities you want this garage to have (given your constraints) and then build that and you should be happy.
Best of luck,
Todd
