1100F which is pure soft aluminum and 2117T4 which is a strong alloy. The hull AL material is 5052 alloy. I would not recommend using 1100F pure soft AL on structural components such as the ribs.
Welcome aboard, lots of projects here where our SCs have been stripped down to bare hull with repairs to the Al as well as deck and transom replacement. With motivation it takes at least a year to accomplish for the average person.
We always enjoy seeing pics :cool:
Welcome aboard, there's a couple treads where guys have made their own splashwell buy having one the size that came in them wouldn't allow for a tiller unless the handle was several; feet long. :D