Additionally, this is basically the same process for converting armor to different base bodies if that is your goal. These instructions are applicable to either Fallout3 or New Vegas, I'm sure the process is similar for Oblivion as well, though I have never tried it. I am the Christopher Tolkein of meshes, what can I say? I can't make anything new. These instructions are also really only for using existing meshes in your armor. These instructions are for blender, I don't know anything else.
I don't know jack about weapons, besides pointy end goes toward bad guy.
I have gotten a lot of questions related to this lately, so sorry to all my e-pals who asked and I never replied.