While othewrs had argue the merits of various building methods these do
not
directly offer any performance improvments. Given the size of most of the
production runs I would look at vacuum infusion for wetting out the cloth.

Aerodynamically the place to go is reflexed airfoils. Note: I did not say
flying wings. Reflexed airfoils can operate quite well on tailed gliders
and
this configuration offers many pratical benifits.

Robert Mudd

Robert
The ASW27 uses a reflex airfoil.
Udo