Number20 will give you the best answer, but that does look correct to me. The only thing that I don't see is that you are not showing any ground wires to the switches, which you will need (hot, neutral, ground, and traveler).
Otherwise, that does look correct for the three way. On the four way, that seems like it will work, but I am not sure as I haven't reasearched that one yet. I just got my electrical plan 2 days ago, marked it up, and sent it back already.

I will have a couple of 4 ways I will need to deal with though, so I'm glad you brought up the question.
I had a very good meeting with our electrician, and we talked about the OnQ system. I told him that I would be installing it, and he said no problem (he has been SUPER flexible, and answered a lot of questions for me...really glad to have him wiring our house). He said that he had another client who hasn't started their design process yet, and really want the OnQ system. So he asked ME if he could help out with installing the OnQ system (at no cost to me), so that he could get one install under his belt.
Could you do me a HUGE favor. Since you already have the drawings, could you add the ground wires and repost (assuming Number20 saays they are correct)? I would love to have these to show to our electrician.