I would think that any person with reasonable metal-bending skills and the right equipment (brake, maybe) could make a magazine extension.
It really is simply a box. Once you get past the tapered end with the feedlips, the metal dimensions remain constant. It's a box.
I suppose a good way would be to sacrifice one magazine for this experiment. Here's what I would do:
Disassemble one mag, and cut it pretty much in half. Build a tubular box out of similar sheet metal to place in-between the two halves, effectively extending the magazine. You would be left with stock feed lips, and a stock bottom end with floorplate, and could fabricate the center section about as long as you want.
All that would be left would be to source an appropriate spring, and with the popularity of hi-cap mags for Glocks (including 33 rounders), getting a spring that would work shouldn't be all that hard.
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