Most of the models lack a balance between detail and plainness. I know what you're going to say is "but these are for blockland detail == bad!!," but that's complete stuff. The colors don't appear to be properly selected and shading is painfully dull. Every single one of these items just looks.. bad. I can't even put it into words, but they're not right.
Also, your TDM is stuff. The scoping system is stuff.
Lag. And no. But it sounds interesting.
Considering that most of this can be done client-side with almost no instruction from the server I don't really see how this would cause lag, unless you're looping it like fifty billion times a second without any sort of optimization.
The only problem is, I don't know how you'd get angles or rotation in on a Torque GUI element.