Today I ordered the yarn.
I'm using Jaggerspun Maine Line 2/20s. I'd prefer a singles, but for this proof-of-concept project I'm going to go with a proven high quality worsted yarn. Fortunately, the historical record includes examples of both singles and plied yarns in the warp.
Some of the yarn will require dyeing. For me, this is the most delightful aspect of a project. It seems to come easier to me than any other process, and it invariably makes me very, very happy to produce pretty colors. Decisions on the specific color palette will have to await a final decision on the patterning, but I am anticipating the palette will probably include at least three rich colors.