Hi Ben. I've been a huge fan of yours for a long time now and this other day i got inspired by a YouTube video I saw. In it a guy built an cnc machine out of old CD drives.It wasn't strong enough to carry a dremel so he just used it to draw. My idea however is to replace the pen with some sort of thing that cuts paper easily like a laser or something. The idea is to cut out paper masks that you could place over any surface and use to spray on decals (i hope you understood that. im not the best at explaining).
Here's the video i talked about: