Re: Ply- Glass- Ply
My guess is that the designer intends to help ensure both enough glue (resin) in between the layers of ply and ensure no dry spots. Wetting out the glass properly and seeing it go clear provides a good visual prior to applying the second layer of plywood, particularly for an amateur builder more likely to be unsure about how much adhesive to use.
This new ship here is fitted according to the reported increase of knowledge among mankind. Namely, she is cumbered end to end with bells and trumpets and clocks and wires. It has been told to me she can call voices out of the air or the waters to con the ship while her crew sleep. But sleep though lightly. It has not yet been told to me that the sea has ceased to be the sea.--Rudyard Kipling