Fine piece of work- I fiberglassed a custom 2 man layout boat a few years ago- and I have a modified sneak box copied from the Barnegat Bay design- courtesy of Norm Strung's plans and dims--

I have way more experience in welding and metal fabrication, so I noticed the welds on the trailer as well and the brace that holds the tail light assembly- My guess- a straight downhand position weld with 6013 mild steel stick rod from the resultant weld bead-- but just a SWAG- nice boat, can we see some later fotos with the brush or camo treatment as well?