First, I don't see any need to adopt any sort of class weight change. I'm just frustrated because I'm big boned.

I would have thought the objection to my idea was the different beam lengths not the weight. The only easy way I can come up with to do it is to have two different sized beams (same extrusion profile though) and tiller crossbars. A creative manufacturer might be able to do something telescoping.

I don't see a reason why a 15 kg lighter boat would be any less valuable. It won't be that much less stiff. Also, there will be more people to sell to because more people can be at a competitive weight.

Not being able to sell a used boat is because the number of people participating in our are is not growing. A few new people are starting to show up. But, an equal number of people are no longer showing up. This is why I suggested making a special boat for big dudes that would otherwise be uncompetitive.