I do just fine without a garage, I have don't countless engine swaps and tear down's, just have to remember at the end of the day if you don't finish it cover it up so it doesn't get water in it
I assume you have "done*" countless engine swaps...
Unfortunately for me, I don't live in a complex with a large lot full of empty parking spaces. The car is in a covered (good) community garage (bad) that is very full of cars, so everyone is watching every little thing I do down there. If I spilled a couple drops of oil, I'm sure I would get a scathing email from the HOA before I could put down the cat litter...
That being said, I could probably do a lot of it down there, but the motor has to come out for the upcoming body work anyway, so if this guy can spare a corner of his shop for me, that would be a lot easier for me. Plus, if my wife doesn't see a pulled motor in my "work shop", my life will be easier... Out of sight, out of mind!