Yes, this is just a schematic drawing I made quickly with Inkscape.
To your question, there is no good reason to do it the way I do it now, except that I can use the Client's Scene files directly. This is all very unfinished, and I think I'll do it the way you describe it in the end.
You are right, it would make it much easier when static objects would be reflected by the navigation mesh, then I have just do deal with dynamic object, which always have an AABB.
Thank you, this is great advice. Now …