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Great and robust one !!! I definitelly start to build it now :-)
(My InMoov hand project is also in progress, like yours :-), I have already printed it all - so I can start something new :-) )

1) Have you based your design on Zortrax arm ? Those model is very sexy but definitelly useless and not robust (gears are very thin, holes are not well designed, the ending arm is without the actual grab bechanism)

2) I found some thingverse personalizer to build more robust gears. I find it great, http://www.thingiverse.com/thing:1339

OpenSCAD Helical Gears