You should check the transom closely also. When the floor went bad in my 86 Sea Nymph,
the transom was also getting soft and I replaced it at the same time. I used pressure treated plywood and fiberglassed it. That was about 15 years ago. Its still solid.
I have a Cabellas chest wader, 5 mill with insulated boot. They were the warmest I could find when I bought them. They are in new condition. I will be in Florida for next 3/4 weeks
before I go back to Va.
I have a new in box lowrence lcx-20 I bought 3 years ago when I retired. Not sure if this would meet your needs. I discovered golf and never installed.