It looks like you enjoyed a lot of time in this boat reeling in the fish. Well done.
I beg to disagree about the 303
Used religiously and properly it will help prevent a boat degrading.
When you say cracked PVC, is it UV cracking and where. Frequently, the AIRE logo says a lot about the general UV damage but your logo looks to be in decent shape. Honestly, how bad is the fabric? In some photos it looks like it still has a sheen. Other photos, no sheen.
Did you get an estimate from AIRE yet. It may be better not to deal with the shipping and repair costs. It might be like remodeling a kitchen for $40k to sell a house that in the end you only get $25k more for after the upgrade.
Perhaps $500 OBO.
But then again, how much spare time do you have. I've seen some beat up AIRE's refurbished and get decent dollars but that was only possible because of A LOT of personal time(not AIRE time and floor replacement costs). A compatriot of mine who had more time than money bought a ragged, butt-ugly Puma post swap for dirt cheap(didn't hole air anywhere and had missing D-rings). I thought he had shit for brains but he ended up selling that Puma for over $800 after using it for a season, and the guy that bought it was very happy.
For example, since you say the floor holds air perfectly, put some patches over the floor voids(the floor bottom looks perfect). I say this because that hole under the captains bay looks like dry(wet) rot from perpetual dampness. Cut out that rot and put a giant patch on it. Keep applying elbow grease to the frame rub and that boat might(???) clean up and sell for $1100-1200(or more, it is an AIRE). If you do try to fix up and sell,,,, don't show the potential buyer these pictures