Homemade Jon boat built from Uncle Johns plans https://www.unclejohns.com/ Took me approx six months to complete. 15' 7" long, floor is 46" wide and sides approx 17" tall. Floor and sides made from 3/8" ply, transom 1 1/2" ply. Outside covered in fiberglass and 4 coats of epoxy. Inside is approx 80% covered in fiberglass plus 4 coats of epoxy all over. Underneath has an additional 4 coats of epoxy/graphite mix. I finished it with Gliden exterior latex paint - figured that since it will be out of the water about 95% of its life and covered that it does not need marine paint. All deck areas have a non slip additive. It is very stable and handles well. With a 15hp motor it does about 20 mph and accommodates two people easily. I recommend Uncle John's plans and http://www.raka.com for fiberglass supplies, both were very helpful when I called with questions.
 
Thanks!
Simon Foord