Regarding possibility of problems at anchor
A 50' expedition sailboat (single-masted monohull) I went aboard some years back, with Antarctic and subantarctic voyages to its record
, has (most unusually) a non-freestanding wing mast (base shown below) which does not have the advanced servo-feathering control surfaces which the OP boat appears to, and would certainly not feather nearly as readily as a well-engineered full-rotation rig* with only masthead stays, even one lacking advanced feathering.
(I'm assuming that's the case with Chris White's masts?)
I quizzed the skipper
(who often sailed short or single
handed) and he said there had been no problems, anchored in very exposed and windy situations.
I think a schooner-rigged boat with such a clean rig lying to an anchor
is already largely self-feathering, especially in comparison with a boat on land which cannot do this. If the masts can quickly feather to sudden gusts from abeam, so much the better.
I'm not minimising the importance of this issue: There may be a problem, but I can well believe there may not.