Now that I have the body slotted, I need a metal follower and a metal bottom. G.T.'s bottoms are the best, and Gerry was able to fit me into his busy schedule and make one for me.
That left the follower. I had a chunk of brass left from the other magazine project so I made my follower out of that.

Battery in my digi-cam was depleted, so no brass milling pics.

Sides are relieved; bottom is spot-milled for spring header.
To drill G.T.'s mag bottom, I had to make another mag body insert <sigh>. Using my previous clamps and the new insert, I was able to spot the mag bottom holes and drill them through. G.T. graciously instructed me how to do it, and for a one-time-only procedure it came out OK.
I still need to make my extended follower button, so I have not pressed the bottom pins in yet (just Cotter pins holding it in place).
I'm not thrilled with having to make an extended follower button. Micro-machining is not my strong suit.