If I wasn't too bothered about the time it would take I'd consider giving the corners a Kevlar heavy laminate and/or bonding on prefabricated Kevlar corner plates. It would save on having to rely on mechanical fastenings. Aesthetics comes into it as well though, and yours sure is nicely finished. I suppose if aesthetics were less of a consideration I might consider having carbon black in the resin and a peel ply finish surface to save another ounce...Hey, what up Dan! If I build again I'd definitely mount my corner protectors differently.