Have you tried one of the plans services. ? as here--
https://www.google.co.uk/search?q=Model+plans+services&oq=Model+plans+services&aqs=chrome..69i57.23466j1j1&sourceid=chrome&ie=UTF-8👍

Andy,
SLEC in Watton, Norfolk do two different kits of the Wavemaster, so may be prepared to sell you plans.

Martin

It was a popular design, Andy, so I'm sure somebody will have one to scan for you.

Cheers,
Martin