As for your other questions, You CAN fully sheet the wing, but that would just add unnecessary weight. You can skip the Wire brace in the rudder if you're not going to be using it. Use whatever glue you like. And Fiberglass Specialties has your cowl. Their product code for it is a "GP-40"

Find it here:

http://www.fiberglassspecialtiesinc.com/catalog.htm