It's probably going to need tires after you get everything repaired. If you're okay doing the repairs, it could be a great learning experience. The Allegro is a well built coach.
I have a 96 Southwind, P-30 chassis with AutoPark. It's a good engine and gives me no problems. The AutoPark can be annoying but, there is a lot of info available on this forum or the internet.
The water damage is the big problem. A small leak can cause a lot of damage if not repaired quickly. Then, there's the mold issue from the leak.
Do your research before you start spending money
It sounds like you have the Allegro at home? :)