I'm in a one-and-a-half car garage. As mentioned by others my body buck is on casters and stays outside most of the time. Having my chassis dolly on casters, and then having the chassis on wheel dollies, lets me move it around to give me a bit more room when needed. Having a good low-profile floor jack made a big difference, as its fast and easy to go back and forth between jack stands and the wheel dollies. Adding an extra light or two made a big difference.

Another thing that helped was investing in some good quality shelving units for the boxes of parts. I put mine along the back wall and was able to store almost all the boxes. Marking the contents on each box when I did my inventory has saved much time too.