Some weaving programs will turn a draft with the click of a button. Barbara J. Walker has a good explanation in her book <span style=”text-decoration: underline;”>Supplementary Warp Patterning: Turned Drafts, Embellishment & Motifs</span>, pp. 6-9, of how to turn a draft by yourself. Not an inexpensive book, but full of fun ideas for 1-shuttle weaving of complex- looking fabrics. Available on her website, her name dot com. Don’t see any turned twill recipes in it however. But the instruction for turning a draft has lots of illustrations to help the reader understand. I read on JST that the 2020 theme will be “Twill on 4.” Maybe she covers it there. Or will now, because you asked?