Thank you for this information. Mast area should be included and you appear to have identified three classes where it isn't. This feedback is useful; with 250 variants to watch we don't have the capacity to check everything. I've spoken to David Chivers, an experienced measurer, and he will try to check the measurements and class rules next week when we are all at Texel. If materially wrong we will correct the figures.
William Sunnucks, SCHRS Technical Committee