I couldn't bring myself to do it. Even Rock Island "cheapies" work pretty well. Now what would be tempting for me would be creating silicone molds of a functional slide frame and barrel. Then create resin castings, with resin that's been mixed with metallic powder. It would look fairly close to the appearance in the photo. The other parts could be all those MIM parts you have lying around. Waste not, want not. Besides, the molds would be re-usuable.