RE: Balsa USA Eindecker 90 build.
Sorry I'm late. Just found this build log. FYI for the future, SR Batteries has an Eindecker kit of 100" span but more they have accessories, namely aluminium tape, thin stuff that can be shaped over curves and then given a machine turned appearance with brass or steel wool and a drill. Check out their web site, they even have some videos that are helpfully. Hope this is a help.