There's lots of good ways to do plywood, just not with polyester resin on submerged wood.
Or even cut them back to half width so they give support but you can still access the standpipe openings if needed. ?It looks god. But i would not put a brace on top of the corners where the standpipes goes.
I think he can pull it of by skipping the two side braces if he widens the centerbrace a little.Or even cut them back to half width so they give support but you can still access the standpipe openings if needed. ?