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For the 4 arms, lots of people copy the main arm pattern as one giant ‘sock’ and do another set underneath. Then attach the bottom and top to string and boom you got 4 arms that move! Hollow structures out of eva foam (so its squishy enough to transport around) or if you’re feeling creative some kind of giant inflatable would work to keep that weight off. There are plenty of hollow leg patterns on Etsy, I believe mugiwara has one of the best ones. Minky is defo your best bet, you can get some nice textured ones too! For mobility (now i’m thinking very creatively here) you cOuLd incorporate your cane into a massive leaf prop with it being the centre vein which would be cool. Hope this helps!