Welcome to the forum
That truck definitely does have some rust issues, but finding a truck that doesn't have any rust issues, is going to be very hard to find, and you will have to travel a ways to find one. Like was already mentioned, the patch panels are available, but you are going to have a sizeable bill with whoever you are paying to do the work for you. And hopefully you can find someone that will do a good job for you. There are lots of hacks out there.
On the plus side, overall I would say that is a decent truck to build from.