Now, it looks like CPES is somewhat expensive. Might it be somewhat
cheaper, and work just as well, to buy a fiberglass mat-and-resin kit
from the local auto parts store and put one or two layers of glass over
the plywood?

Also, the factory rudder is a kickup design. Should I go ahead and
attempt this, or should I keep it simple? Any good sources for design
ideas for eithe fixed or kickup rudders?