This might help someone else, I know it did me
. As folks know, I had issues with placing doors with walls from different packs. I got a wall in the door every single time.
If you find a wall segment you like, create a room segement with it(using signs or magicpfs or whatever program creates these for you). Then use the room segement, either the entire room or just paint the walls and the door will work perfectly.
I did this with the Raptor packs which I *love* and it works like a dream now.
Thank you to the author of Magic FPS who gave me the idea.