In the other thread, there is a post about checking for twist right side up, so that it can be filletted without moving the boat.

I'm not sure I'd totally agree; In the Tred Avon I am almost to finishing stages I had a problem. When I tied it together, I hung the boat from 4 level places at the sheer (why everyone else spell shear?), and hung a string on centerline, and off the bow and stern. I lined it all up, and filleted.

When I turned it over, there was also a spot on the stern where the side and bottom panels join that was not symmetrical; one side of the hull had mor volume if you can picture that. I fixed it pretty close by cutting the chine open, from 6" to about 24" from the stern. Then I clamped it in place and re-filled the fillet.

I think if I do another stitch'n'glue, (this was my second) I'll stitch it upside down, line it all up the same way, and dab fillet spots every foot or so on all three (or more) seams. Looking at the boat upside down give a much better view of overall fairness but it may be harder to get the seams filletted. It's the most critical point in construction, and worth the time to get it right...