If you want to check Baby Yoda among other structures real and imagined for proportions, especially the Golden Ratio, get these files for Corel Draw, or Adobe Illustrated or there’s an SVG. Let us know if you need a different format or other help and we’ll see what we can do. We use baltic birch 1/4″ thick. You can adjust the diameter of the holes if you have some hardware available that is different than ours.
Large calipers are nice for a whole class demo or for finding ratios like Elbow to wrist to longest finger. The small calipers work on 8×10 photos or you can hold at arm’s length and align with distant large structures like buildings. I’m showing the pointy large golden ratio calipers but the ones in the file are dull.