It's looking good so far, oh and BiO I have to disagree, there are quite a lot of Gundams/Mobile Suits with oversized parts or weapons, but that makes them mostly space use only (e.g. Kshatriya). The knee needs improvement that's true, what you should be careful with are the arms and shoulders.
Hmm, this looks like a bit of an improvement over your previous Gundam-like, but I've got a few suggestions. 1. The knee armoring needs some improvement. Angling pieces like that almost ALWAYS looks bad. Sorry, but it's usually true. 2. The backpack, things, look a bit oversized. Try toning it back a few notches. That aside, it looks pretty killer so far. :)