Bob, I was looking thru that kit yesterday. So I got it out again when I saw your post to see if there was a date on the plans. Nope. No date. None on the Lil' Raider plans either, sorry.
They made a beautifully engineered kits, for sure.
The initial Stanzel patent appears to be #2,558,109. It was filed on March 9, 1945, but not granted until 1948 (according to one source) or June 26, 1951 according to what is stamped on the patent itself.
https://www.freepatentsonline.com/2558109.pdfIf you put an authentic ignition engine on it and took your one-line maneuvering disadvantage points and, this is critical, you paint it like an old deBolt kit, you'd likely slide right thru the inspection...?
Dave
PS--I took my monoline trainer out to the field Sunday to see if I could get a first flight. Good think I talked to the speed guys: the controls were beautiful--but backwards. UPski was downski. Now I gotta rebuild the controls again, somehow.
PPS--Can you point to your source, Joe? I'm curious now. I suppose we could try calling the museum?