I'm sorry but I somehow missed this back in July. The washout is set with tabs on the ribs. As far as the dihedral. I don't know what the full scale is supposed to be. However I think Hostetler is using the scale dihedral.I'm in, this is quite an undertaking! Looks like the plans need some revisions. I've had CG, World Models, Ohio r/c (Super & Pepsi) Chipmunks and enjoyed them very much. I'm enjoying the photos and comments. Curious to know if this planes plans show washout on the wings? Will you keep the scale amount of dihedral or lessen it? Looking forward to your build. Thanks for sharing and great progress!