In these two pictures below, you can see that Ex_co_ship_cabindoor only has one side to it. How would I go about adding the other side of the door? Would I have to copy all the parts of that one side and insert them on the other side or something? Can this all be done in NifSkope? Thanks.

http://img340.imageshack.us/img340/2679/35666752.jpg
http://img200.imageshack.us/img200/3858/93763768.jpg

http://www.megaupload.com/?d=VL5CLKZL

Well to answer your original question(as I see Antares has provided a download). You would have to use a program like Blender to do it. The reason the door only has one side is because that side was deleted/never created to save on polys(they likely made it from a plain and if you render a plain only one side is visible). I suppose you may be able to use nifskope, but that would be very tedious at the very least.(I have never tried making anything new with nifskope so I dont know if it can even be done) The reason to use Blender or one of those programs is yes, you could copy a side or at the very least not have to deal with single vertices at a time.

Thank you Antares. What did you use? Blender? I want to learn how so that I don't have to come on the forums to ask. I mean, what if there are 100 doors I want to do this to? It'd be inconvenient to post 100 times on the forums asking for people to make this for me. I already have the latest 32-bit Blender installed.

I used Blender.

You can use any Blender tutorial to learn how to use it. The first thing you need, is the exporter but I believe you already have it. If you don't, you may find the needed files in my animation tutorial.

blander*