Dzordzbuzs

I can't help you exactly but "Project Nevada" has a working double barrel shotgun from Point Lookout maybe you can learn some thing from there ?

The regions tab is that what you are looking for ( World>Regions... on Toolbar) it lets you create a new region in your worldspace with any data you want, weather included. Check this page for more detailed information

Sorry I cant help you with Blender because my experience with it equals zero as for the Autocad I have no idea what that is. Anyway, rebuilding the areas with original nifs might be worth of a try however I doubt it will solve the problem completely.

Well I'm not any kind of a specialist regarding 3d modelling but if I were you I'll try to replace those meshes with some simple-shaped ones. Especially the "SUBcratewall" 47825 kb for single mesh is way to much, this object is simply to large to be loaded "on fly" not to mention it may cause significant FPS drop because of the number of separate shapes loaded at once. The same with the "SUBGoldBarPit" try to reduce the number of gold bars in that object. So basically you need to lower theirs sizes by simplify the shape of those meshes as much as it's possible, I think that should solve the lagging issue. Sorry for My English.

What's the deal with the file comments ? I have uploaded my file this day and noticed that the comment topic is locked and I have no ability to change this, I have tried to re-upload the file and check the user permission settings twice to be sure if everything is ok and again comment topic is locked or maybe I missed something ?

Here you go "Frozen World" by fLokii