For me, the aluminum would actually be easier to machine (chips can't mix for recycling and I don't feel like cleaning out the machine before and after). 
Aluminum machines like butter anyways with good equipment and carbide tools, and you can anodize it whatever color you want. The only reason I could think of using plastic is the feel of the temperature difference on the grip if I make a version with a pinky extension, but I don't think that would bother me. The thinner areas plastic would be weaker than aluminum. Black Delrin (plastic) could be a good option, but I would need to check it's chemical compatibility.
Ol'coot's design looks awesome how it blends to the bottom of the grip and meets up with the backstrap. That is one of my plans... to make it look like the polymer frame and magazine were engineered together rather than the "afterthought" look. Right now it looks like the designers said "oops we forgot this thing needs bullets, quick, someone find a magazine that will fit before we get fired!".
You're right, the radius on the back/bottom of the grip does make things a bit more difficult (but not impossible) for this plan.
The other plan is to make one that is just really low profile, black, and close the gap some between the frame and the base plate.
Tilos, I definitely welcome the help, and I may need to "pick your brain" on this soon, but I need a little time to get further along first so I know what questions to ask.

Aluminum machines like butter anyways with good equipment and carbide tools, and you can anodize it whatever color you want. The only reason I could think of using plastic is the feel of the temperature difference on the grip if I make a version with a pinky extension, but I don't think that would bother me. The thinner areas plastic would be weaker than aluminum. Black Delrin (plastic) could be a good option, but I would need to check it's chemical compatibility.
Ol'coot's design looks awesome how it blends to the bottom of the grip and meets up with the backstrap. That is one of my plans... to make it look like the polymer frame and magazine were engineered together rather than the "afterthought" look. Right now it looks like the designers said "oops we forgot this thing needs bullets, quick, someone find a magazine that will fit before we get fired!".
You're right, the radius on the back/bottom of the grip does make things a bit more difficult (but not impossible) for this plan.The other plan is to make one that is just really low profile, black, and close the gap some between the frame and the base plate.
Tilos, I definitely welcome the help, and I may need to "pick your brain" on this soon, but I need a little time to get further along first so I know what questions to ask.





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