I did the fiberglass tape layups in the bottoms of both wingtip, plus glassed-in the first half of the marker beacon antenna in the left wingtip. The top stiffeners will be glassed in once everything cures. I used medium weight (5 oz), pre-cut 3"-wide fiberglass tapes from an R/C model store along with West Systems' 105/206 resin/hardener to make the layups.
This photo shows that the Marker Beacon antenna is just 40" of stripped RG-400 coax.