First, I am deeply saddened at upsetting Audrey and wish I had not done so. I would ask you not further contribute, we are friends and we need to allow each other our peace.
In answer to your question… And I would hope Bernhard will correct me here if I err…
You might find Jerry Brown’s harpbuilding book of interest, Liam (if you don’t have it already). You certainly have the technical experience and enthusiasm going for you!
I have .008 strings on the Golden Jr and I note they are almost like razors, so there may be an advantage gained to the thicker strings once you accustom yourself to them.
The soundboard on the Limerick is 5-ply Finnish aircraft birch. Doesn’t get much stronger than that, or so I’ve been told. Constructing this kit was a dream-the soundboard slid right into slots pre-cut into the sides of the soundbox, no finishing strips to glue on or sand. The base is also pretty wide for a lap harp, a little awkward (knee-bones are a must!) but the projection is awesome. Had a soundguy in awe of this harp at a festival I played at this past summer.
Whoops, sorry Liam. Yes, you do have the chart right, I had to copy it from my sheet and that was how it was listed. And it appears your strings on your Druid are even thicker than mine. I feel ashamed for belly-aching now! LOL