I've got those 1/4 scale speed 6 plans... got 'em from the designer in Australia!
Played a fortune and they weren't anything nearly as well drawn as the ones that where publish in the UK magazine a few years later.

There is a 6'er hangered with the Shuttleworth collection, a real beauty and I was even in discussion about purchasing it some years ago...seriously. Went with dot coms instead and well... you know the rest of the story.

The engineer was telling me that it had a different wing, can't remember what he said but it was different from the plans I'd bought.

Needles to say, that was enough to halt the building proccess.
I'd love to catch up with this project again as the 'worths 6 is a stunner!