Im interested in this too, just a few observations

These are free standing rigs and depend on a bearing within the foot of the mast to be able to rotate. Ive no idea of the loads imposed or the safety factors employed. I realise that carbon is the ultimate material choice, but perhaps for a home built something out of E Glass or Kevlar 49 reinforcing is better.

Because they are a cantilever design with no standing rigging, they face quite high loads just above the deck. This necessarily brings large diameters to masts in the order of 10".

There are several ways to go about fabrication, you could have a strip plank mast that is glassed over in a system recommended by junk rig advocates, and it appears in the Gougeon Brothers on Boat Construction book, but its very brief and simply descriptive. Alternately a buck or mandrel could be used and removed after construction.

Layouts differ too, in that the strip plank makes a hollow shape that is a facsimile of the finished product, or a box spar could be made and faired on the outside with non structural components much like how aircraft wings are made

Ultimately as more money can be saved on this part of the boats costs schedule than any other component sans the hulls, I think it is important to examine ways of fabricating masts that are safe and wont collapse.

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