By the look of it the dragon is cut into the surface of the IO cover, so that gives you a nice and flat surface.
I’d get some reasonably sturdy card stock and cut out a cover piece to match the shape of the dragon panel or the entire IO cover. Slap some vinyl wrap to the card stock and just stick it down with some double-sided tape.
Over the years modders have used things like X-Carve, Ooznest and Shapeoko CNC machines and they seem good enough for acrylic, but they’re not rigid enough to start messing with aluminium.
For a long time Maki Role/Praetex Design was using a High-Z T-1000 and produced some stunning work, but we’re now talking semi-professional equipment costing multiple thousands.
You’d probably be better off heading over to https://www.reddit.com/r/hobbycnc/