Kelly Hogaboom and Julian Collins did a Simon(e) sew-along, and they've got videos of all the steps. If you're looking to make this pattern, Kelly and Julian can guide you start to finish.
You can find all the material's on Kelly's site: #simonsayssew with kelly hogaboom & julian collins
Simon is a highly adaptable shirt pattern for people without breasts.
Finished projects from the freesewing community: