If we get Guardian done, my bust is history.

I've been crunching the numbers -- I'd like to do it - even with lesser people than for Superman.  I'm thinking of getting a mold/casting kit from a hobby store, pumping out a cast of the current Guardian and practicing painting (with an air-brush and hand brush) -- Guardian shouldn't bee too hard -- and it would keep costs WAY down.

No. But it's as close as I would ever honestly expect to see.

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So, for someone like myself that customizes action figures, how is the bust different from what you envisioned?  I'd like to do my Guardian up right.

Altho I sometimes "cheated" to allow a greater range of "expression", I
intended that Guardian's mask/helmet be smooth across his face, not
contoured to his features. As if it was the top half of Iron Man's mask,
rather than Batman's.
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Yep. And that's why the mini-bust doesn't look quite right, since the mask wraps around his nose.