You do have a project. A good base for a fun and stylish truck. I would encourage shopping for a replacement cab from someones parts truck as you would probably come out better in the long run. You would be able to minimize the serious metal replacement needed on your cab and the associated costs. If you watched, and put out your feelers, I bet you could find a "DRY" replacement cab out in west Texas that will not have the serious amount of rust your current cab has. That is just my 2 cents. Minimize the cost of body work, and keep your project moving so you don't loose interest. :-)
Alan