If you’ve got the head room, an office above the bathroom on a mezzanine would be ideal. Tape out a 12’x12’ or even 14’ square from the back wall to the side wall and imagine that space “up”. Lights under the mezzanine with tool boxes and benches would make a nice bright work area with plenty of room for the lift and vehicles.
I’d be doing a mezzanine no matter what....either storage or an office you’ve got the height and it just makes sense.
Happy belated birthday, Lance