An 8" x 4" hole in the middle of an old P18 sail sounds very repairable by a sail maker - who will likely be able to make a reasonable color match as well. While there may be no sail lofts around Lindale, Dallas has a few.

As for missing titles on old beach cats in Texas - thats very common for boats that have not changed hands in a long time - I think in the past they neither required title or registration. It takes a little work with the Parks and Wildlife to get a boat registered, but it is possible (several of my friends have done this).

Good luck with your bargaining!

Chris.