This may be in the wrong place, but it will be a restoration eventually. I am going to look at a 69 Dorsett Catalina this weekend. Being a 40+ year old boat, I am sure it will need a transom at the minimum. Should be easy enough to do with seacast. If it needs stringers and a floor that will probably require the whole cap to come off , A bigger project than I think I want to get into at this time. Any advice on checking the floor and stringers before I buy? I cant start drilling holes in a boat that isnt mine yet. What are some tricks to checking things out non- invasivly? Thank you.