I love old pontons and have once tried to restore one myself, gave it up after two years and lots of money spent on it. Did I get the investment back? Of course not. So if you allow me, here's my 2 cents:
If you are a mechanic or have a brother/cousin who is one and is willing to help you at no cost with plenty of time to spare for the project, you might want to go for it. And if you do, consider to spend north of $10 to $15K for definitely needed spares (by the look of the car). If you have a job like most of us and can only use your spare time, it will take you at least two years to finish the job. Most probably you might run out of steam half way.
If you are not a mechanic and your brother/cousin is neither, forget it NOW and walk away with a sane mind! To put it right via a third party, it will cost you at least two times the money you will need to buy a good one now. And remember, the good one now you can drive today. This project of yours needs plenty of time, plenty of stamina and most probably financial resources beyond your wildest imagination.
As I said, just my 2 cents :-)