David.
thank you very much.. your help is very appreciated...

For the absolute center I am using a hinge marking tool... and I have measured and marked the location of the rod and hinges...

I don't have any epoxy yet... tommorow or wednesday I will be picking up 5 min and 30 min from Hoby Lobby craft store... I did not expect to get the board today.. but excitment is making me check and recheck all possiable next moves... I'll go ahead and notch LE for the rod and make my hinge joints... I'm already checking all the wing instructions and getting the ribs sanded and ready...

Once againg thank you for your help...

Tommie