Re: Grady white soft floor
.BUT...the floor is soft..
It's just about a guarantee there's more going on than just a soft deck. Almost certainly there will be wet/rotted stringers as well, and more than likely the transom also, especially considering the extent of wet/rotted deck that you describe.
I'm currently working on restoring a '79 Checkmate - the previous owner swore up and down the only thing wrong was a soft spot in the forward deck, just replace that little bit of plywood and she'd be fine. Yeah, right - at least I had a pretty good idea what I was getting into and bought it as a project boat. EVERY piece of wood was soaked, as was the flotation foam.
In any case, if you're inclined to do the work yourself it's not going to be horribly expensive. Prior to starting work on my Checkmate I replaced the deck, stringers, and transom on a 15' fish-n-ski. Total cost for materials was around $500 or so and it took me 6 weeks working on it evenings and weekends. There are many threads here to learn from on what needs to be done.
On the other hand, if you're just talking about paying someone to do the work, considering the amount of labor involved in doing it right, it would have to be at least 2 or 3 thousand dollars. Someone could probably just lay down plywood for a lot less, and you'd never know the difference for a year or two, but in the end you'd have to do everything anyway.
