: Do you cut it to it's final shape with a fine-tooth coping saw?

I cut it with a band saw about 1/8" to the line and then used a sander to get the final shape.

: How hard is it to cut?

It cut easily. Even with a coping saw. I suspect that it will dull the blade faster than wood.

Do you just glue the two "L"s together
: with epoxy and a spacer?

The two "L" that make up the wings are bolted together with stainless bolts through a plastic spacer. There are also two plastic washers between the wings and the rudder so that it can be deployed/retracted easily.

Vaclave sells the plans that show you how to do the whole thing.

Regards,

Jack