I dont think you will get the std mags or aftermarket mags to work. They require more strength from the sprung latch and frame than what the plastic ones offer. If you held both frames in your hands and actually felt the amount of tension on that spring you would likely agree.

Dont want to discourage tinkerring, but in this case, if you're doing it to save money, i think you're wasting money. If you are doing it just to be creative, innovative, curious, "thinking outside of the box kinda thing", go for it.