Don.
Looks great.
Remember the lost foam technique I told you about previously?
Well you are essentially doing the exact thing using the plywood.
My suggestion is get some 1" or 2" foam sheets from the local lunber yard used for insulation (they are usually 4X8')
Cut them down as you would the plywood mentioned earlier.
Bond them together with 2-sided carpet tape and shape to your desired contour, now you have your mold.
Glass over the mold.
After the glass has set, invert the body and gouge out the foam (no parting agent needed). Whatever foam remains, wash out (dissolve) with Acetone or Laquer Thinner.

Wa-lah!!! You're done. But with 1/2 effort and time !!!