If I fit 4+ in it, it wouldn’t be to fish. More for food, drinks, music, etc. 2 is the likely number for fishing outings.
The garage is 21 ft. I might be able to stretch a 17’ in there, but because of where the hot water heater is, the motor would likely have to sit right in front of the door into the house, so there needs to be a little wiggle room there.
How long have you had your Rebel and what HP motor did you get? Anything you’d change?