To be honest my 3D art skills are limited to the Gamedev.tv Blender course (think chess pieces textured, Pixar-style animated lamps, or quick box-models). I don't have a lot of sound design skills except for equalization and cut/pasting in Audacity, or using a midi keyboard and sound font library to make cheesy effects or small jingles! Jack of all trades master of none type thing!
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As long as you are not a complete beginner and are motivated to finish a game, sounds great to me. If you'd be ok doing sounds with us (we have a musician not experienced in sound design) you are more than welcome. If you'd like to try and make some 3D art that would also be great. You can look up my team and join our dashboard @ Crowdforge. We are currently 6 people, I think with you we could finish our line-up and be a well-rounded team :D my profile in Crowdforge is https://crowdforge.io/profile/Aramos, my team is the one in the right (which I created).