Its not actually a Radio Modeller plan but a RC Scale Aircraft plan RSQ1584 from 1988 Winter issue The plans should still be available from Magicalia in England
www.modelflying.co.uk who have taken over most of the MAP/Argus/Nexus/Highbury/Encanta magazines .Phone 01689 899200. 9am to 3pm. (It was available about a year ago. )
You can also buy a reprint of the original article if you ask.