This was a little trick I came up with back in the early 90's after I got my one gig windows computer. I was using one of the first versions of Print Master Gold, a publishing program, and using a scanner back then, I scanned a drawing of feathers into the computer, then scanned a ruler as well. I combined these two scans into Print Master and figured out a simple method of scaling anything from pistols, to feathers for my sculptures. Hope you can make sense of what I'm passing on.
Pictures I scaled in the video.