Did you ever sell the boat? Are the composite stringers a pick up able item or is after install. Also if this is an install cost, is the $2500 price include the removal of existing stringers? I have an 1985 sunsport that I am about to dive in on as I would have same cost into my boat and rebuild, as you are asking for yours maybe a possible trade? My engine seems strong but I haven't gotten a compression rest or anything like that done. If the trade is an option I could bring it in and get it checked out