Very nice CAD work! And the revisions all seem good. Not too sure about the need for two actuators, a single one should be sufficient, unless the ratios are very extreme. Plus, running two actuators, unless there can be some independence, sounds a bit risky to me. If one gets a bit ahead of the other the whole lot might lock up and you'll burn either the motors or controllers up pretty quickly.

By the way, did that GR02 model come from the 3D warehouse?