Nice work. If you do plan to eventually add sails, Sewn cloth sails are WAY overscale. Several years ago, I compared various thickness of fabric with some #10 cotton duck canvas left over from a canoe rebuilding project.
Results (Thicknesses in inches)
#10 canvas- O.034”
At 1:76 scale = .00045”
Muslin cloth .008”
Washed drafting linen .005”
Rice paper .002”
Very fine cloth at 1:76 scale is, therefore, 11 times too thick compared with heavy cotton sailcloth.
Likewise the weave in any woven cloth would be too coarse and any stitches too big.
Rice paper is still 3.5 times as thick but at least you would avoid the coarse weave ans oversized stitches.
Roger