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I've been putzing around with MP Shockwave some more, trying to figure out some kind of improvised storage on him for his mini-me gun, and I found that you can actually store the spare hands in the hollows of his leg.
Shown here with a transparent saluting hand and a transparent left fist (right fist fits as well). They don't actually peg in or anything I just have them taped in, but I think you could very easily glue in some sort of clip holders within his legs to hold them in place.
And if you were to shave off a little bit of the inner mechanism of the knee then I believe there would also be enough room to store a cannon hand instead.
Unfortunately this doesn't work in his gun mode because the same hollow areas become filled, but it's still very interesting and potentially a very useful mod idea to explore.
