Unfortunatly, Cinema 4D is not a proper animation tool that would port to source. Try your hand at animating 3D models in Maya or 3DSMax, as those are the proper tools to make animations for source.
and dizzyone i have iver 3000$ of proffesional animators tools in cinema4d maya and 3ds and i plan to try
Thats why it is good practice.I'm not an animator. But I do Know That studing the human form is the best way to improve. This is a challenge in order to build skill. If he gets it looking crappy, he will still have learned alot.
im gonna do that vesssboy it seems like it could help, sadly i dont have MOCCA yet so animation is alot less easy
quess ill update this a lil bit, been working with Andrew Boetsma, hes teaching mesome things(hes in my programming and com tech classes) for those of you thatdont know him hes head modellor of black mesa source :D anyway so heres something i made and i got mocca, turns out its in the character tab http://img412.imageshack.us/my.php?image=randomshotgk7.jpg