Well, I want to create 3D AABB collision detection, which I guess means your collision detection wouldn't work, and I think it would be interesting to make my own (but thanks for the offer!).

My plan:
Each entity would set it's bounding box (a rectangular prism) via a function I make, or just changing some skills, and then I would make a function for movement. The move function would use the bounding box to check if it's intersecting with another bounding box, or the level (not sure how I would do this, as c_intersect wouldn't work with the level, and c_trace only makes a line).
If it's intersecting, it would try fixing the problem, which could be done several ways (a simple solution would be moving to the previous position). I think I know how I would do gliding, but that's irrelevant at this point. I really just need help creating the bounding box. Is it possible for the engine to check if anything is inside a rectangular prism shaped area? I don't think c_scan would work.