Here is some info for the lines question from Micah Helser in the last issue:
In regards to how to stitch harness lines, when I make mine I cut 2-3 lengths 1.5 inches wide out of the hide on its longest side. The ends of these strips of leather are rounded and then run through a skiver to taper them. These tapered ends are laid together and stitched in an oval pattern. Then I usually also rivet it. If you don’t taper these ends before stitching they can catch the harness and you can lose your control of the lines.
Hope this helps. – Khoke Livingston