Welcome to the world of old school Supras! I am currently working on an 84 Rider, and I too have found the rot. I am documenting the progress on a web site listed in another post. I am trying to take as many pictures as I can. I have not got to the stringer replacement yet, but will take photos when I do. I am lucky that the main stringers that hold the engine are good, but the secondarys are bad.

As for replacing them or just repairing your stringers, it depends on how bad they are. The only true way to tell is to get the entire floor out. Sometimes, the stringers can be injected with Dr. Rot to rebuild them. If you search the net, you will find pictures and such. Iboat forum http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi has a lot of projects inwork.

As for someone else doing it, I was looking from 3K to 7K for all the work to be done. It depends on where you are located. I decided to do it myself, and it is taking a lot of time. So be glad you have another ride this summer.

Mike