I have built 2 and flown one more Compensator and 1 inch under each tip is good dihedral yes pull a string across top and its flat. Compensator maybe the most honest airplane SPA legal only mod to consider is maybe strech fuse a bit from wing saddle to tail 1.5 inches or so. Did you purchase the streched version of kit from Eureka? Please do post more pictures so we can enjoy the build.
Thanks

Tim

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