Kewl airplane, I've been collecting info on it for years but there is not much out there. John Ponds old time plans listed 4 plans around 17-25". And he lists 2 plans at 68". I bought one of the 68" ones and I would describe it as spartan at best. It shows a couple wing ribs, and the turtle deck formers and thats about it. Oh, it's for the Hisso powered version not the radial powered one. I believe all John's plans were donated to the AMA so you would have to write them to see if you can get a set.
My scale reference guide from RCM lists an R/C version at 68" that was published in MAN december 1968.