Scott,
THANK YOU for taking the time to measure. This is encouraging for sure.
Let me see if I have this right. You said
With my lift on the 55" lock (actually 55.75" for me), my clearance from the top of the rail to the ceiling is 59".
So at the 55" lock I'd have 55" of clearance since I have 115" ceiling and you are at 119" at the measurement point. Enough for the 911 but not enough for the GTO, especially considering I need another 1.5" or so to get it up off the locks.
However, at the same 55" position, you have 55.75" of room for the bottom car. I'm hoping I can fit either my GTO or my BMW in that space. It's going to be VERY close! (I hope my floors are level!)
Wait, I just had a thought: my BMW roof is slight arched from side to side, meaning it's taller in the middle of the car than the sides. Frankly, I think all of my cars are like that. That may give me more wiggle room since there is nothing between the runways but drip-trays (and the jack tray maybe which can be moved). I'd love to keep the BMW under the 911 rather than the GTO so I don't have to move the GTO to get at the 911.
This is going to be close! ****! It may come down to air in the tires!
Time to go out and remeasure the cars.
Thanks again for the info. VERY helpful.
PS ONE MORE QUESTION: HOW THICK ARE THE RUNWAYS?