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Doubling the main foil effective area (due to endplates) and adding in 10% contribution from the forward rudder gives you a main foil Col of ~ 0.7. 

I make the Col ~ 1.55, for the aft foil only. If you add in the forward rudder horizontal foil area (say, a quarter of the area of the aft foil) you get a (combined) Col of ~ 1.04, which fits better with AoA’s of 3.0- 3.5 degrees. Or it could be that the endplates really do effectively double...

Thanks for the info on the horizontal part of the H foil, I was really asking about the section on the horizontal part of the canard/forward rudder…..

@JulianB, was the canard T (horizontal) foil asymmetric section, or symmetric and relying on AoA only for lift? Presumably more consistent and predictable balancing as a symmetrical section?

Totally agree. I wouldn’t work in anything else than wood or ply. A possible problem with (too) lighter skins is puncture resistance?

There are other options, even stronger/stiffer, with a much thicker structural core for the same weight as ply and can be used unidirectionally, in any direction to suit: https://paulowniatimber.com.au/marine.php A renewable minimally processed product, also grown and available in USA and many...