It might not be necessary to assume that a trapeze version goes with the round hulls and higher construction skill.

I note that your spreadsheet indicates a target age range that spanning both Wouter's original target and the younger kids that others favored. Not sure if this is generally agreed by everyone else. Still interested in knowing the ages of the kids RG is talking to.

Also curious whether "one design" is still the consensus. My impression was that Chris and RG are both pursuing separate designs with the expectation that they will both fit into the box rule defined by the measurement form they put together.