Well I went and looked at the bus tonight. It had an unfortunate amount of rust. Not horrible, but more than I'd like. The drivers seat had been changed out as well and did not fit well. It drove decently alright, except that the throttle stuck to the floor.
The transmission felt very strange, it may have been unsycronized by the way it drove, either that or it was just very worn out. Shifting was easier without using the clutch than with.
Overall, I don't think its quite what I'm looking for. A little too harrowing to drive. Interestingly, and I have no idea how he did it, but it was titled as a passenger car. Not a private bus, not a RV, but as a car.
The search continues!