Here's the first version of the stab. This is as scale as I can make it with the materials on hand. This version is with hardwoods (dowel and stock) and weighs 16g. Now that I've got the construction figured out, I'll make another with balsa dowels and balsa TE (but retain the 3mm hardwood dowel LE and 1.5mm bamboo ribs). I can then compare the rigidity of the two.

I might also try reducing the sizes, and use 3mm hardwood dowel for the diagonal spar and 4mm stock for the TE and 2mm dowel (or 1.5mm bamboo) for the leading edge. This would be a bit closer to scale thickness.