IMO Fred it's worth having a go yourself as one of the guys have said east coast resin supplies are very good they also take on repairs but they have lots of info and videos to look at , I made a console for my sib rang them up told me what to do and even what kit and quantities I needed. Guys on here will help too. For tube repairs Paul Tilley on here will cost for you but if budget is a problem contact poly marine again they have loads of info on how and what kit is required also rib shop. If the engine is running ok give it a good service because it's not been looked after you have seen first hand how he treated it. A good clean throughout will make it look different to start then repairs.
It's a project for sure but it will give loads of pleasure when you use it knowing its your own hand that's got there.
Best of luck start a thread if you take it on we all learn from them.