.. not sure if a plan is available...
That reminds me...
I just saw a post, elsewhere, by 1971 F2C European Champion Pentti Nore, saying that people did not used to build racers from plans. Who wants to fly something that someone else designed anyway
... you'd just start building and made it up as you went.
Maybe you made a plan afterwards, maybe not.
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I've been watching some old-timer free flight discussions and got the impression that a plan is not - or did not used to be - for duplicating what the designer did: it is a general idea, and the builder should work out the details on his own.