Compared to my sheeted foam patriot wings, you came in on the light side. I started at 13.5oz per panel. After 3/4 oz fiberglass, 5 color paint and clear, I was up to 17.2oz (1.3 oz heavier than your Monokote)

With hardware, some bug splats and a little oil, the weight of one wing panel is now 20.4 oz.

Looks like all your extra effort for built up wings paid a significant 10 oz weight saving!