Not an industrial user, voted doesn't make a difference. If would lower the cost, leave it natural but I like the idea of different colors for metric vs standard.
Why don't you mark out the location with pins and strings? If car is movable, roll it to the location and sees what works. I had a 16x20 garage in the other house. It was tight once you bout a shelf and workbench on one wall.
This coupon is one time use only. I guess they also look at email and IP address. Have to do it form another location and use a different email if you want multiple.