Concerning the length.
I have seen more than one older city garage adapted to the car by building out a doghouse on the backside.
Dog house was just tall and wide enough for the front end to go through
First time I ever saw one was when REDs came about.
I knew the car. When I drove up to his place the garage looked waaay short.
Yup, I looked outside and then inside.
Remember the old bugs bunny cartoon with the Arabian tent. Same deal. Little tent outside, palace inside.
The fellow built the dog house because zoning and property taxes for a garage add on was an impossible barrier.
With the dog house he mentioned that zoning never sees it.
I looked out back and true, he had camouflaged it by making it look like a real dog house.
Different siding and shingles than the garage.
Even painted a black hole on one end to look like an entrance.
You had to look twice to realize it was fake.
I have also seen 2 piece diggers. Even rear engine versions. Give that some thought.