Stitch-and-glue construction, along with the development of epoxy and modern mahogany marine plywood, has revolutionized and revitalized wooden boat building. this. What are the differences between drop stitch air and plywood floors? once inflated, a high pressure air floor becomes as rigid as a. The following is a tutorial on hand sewing leather using a method i have developed over forty years of seeking the "perfect stitch". it works for me..