Will be following this project with interest. The Smog Hog followed by the Astro Hog were landmark models of the era. Will you dare to join the wing panels just by splicing the spars as shown on the plans? I don't recommend it, years ago when there was still a few period Hogs around a club friend had a wing fold made that way. By the way, in the UK Peter Hunt was an early pioneer of R/C and published a book during WW2 in 1942 called Radio Control for Model Aircraft. In the book he describes methods for achieving multi channel including tuned filters and tuned reeds.