Pourable stringers & Transom?

[spareparts]

there is a patiicular boat that I've been watching for several years, waiting for teh right time to purchase it, that will require a transom and stringers. I've been formulating all kinds of ideas to go about the repairs. There used to be a company named compsys that had foam stringers with teh glass stiched on them, you just called them up, gave them the dimensions and they sent you what you needed. You position them in place, applied the resin and it was done, its not cheap though. My second idea was to cut the very top off the stringers, dig the rotted wood out. Cut pieces of coosa or penske board to fit inside the existing void, glue them in with epoxy or arjay, then lay more glass over the top and down the sides. If the existing glass is in good shape, why cut it out