the 6x6 pieces have 2 functions(so far as I know).
First, they lay flat when they build the deck upside down vs a large sheet that might be curled.
Second, they prevent water from one screw hole wicking from one end of the deck to the other.
btw, have you ever glassed upside down before? its not easy. especially a large surface. The glass is gonna want to droop and fall off.
Thinking about it...
I would probably use one piece, glass the bottom side on a table and let it cure.
then coat the rest with resin and let cure. Coat the cleaned inside top skin with resin and cure. then use thickened resin as adhesive, slather it on the top of your piece and push it up in place, hold in place with some screws from the top(try to use the holes for hardware that have to be there anyways). Then glass the inside edges.
ARe you using boaters resin(polyester) or WEST epoxy?
Poly is cheaper but I find that I can't make more than 4oz at a time or it gels in the cup before I'm done...I have a lot of hockey pucks!!! and you have to count drops when mixing hardener.
The fumes suck too.
WEST epoxy is very expensive but much more pleasant to use if you have the pumps
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