Here we meet again! LOL! I'm the Hybrid duck boat guy.
The Marshmonster guys seem mostly quiet from what I've seen. They have some plans you can find by searching online. The boats have a good reputation and the plans are easy to follow from what I've heard and seen.
As for your big boat project. Jacques, Shine,and the other guys over at Bateau.com will have more applicable information. Check out their stuff as they sell plans and supplies for building larger boats.
Ultimately you will end up learning stitch & glue very well. Use epoxy, thickened epoxy is used as a glue to hold the stringers in place while you use FG tape to formally install them. The worst part is getting to the stringers and preparing the hull to receive the new ones. Wear long sleeve shirts, a respirator, and don't be in a hurry. Talcum powder or liquid soap (applied & allowed to dry) will keep the FG particles from embedding in your skin and itching like wildfire.
UScomposites.com may have the best prices for your epoxy and materials. Check the shipping tho', sometimes it gets pricey.