I checked the textures you've already made in your Swadian pack and they are a different size from native textures (btw they are just gorgeous). this would mean that you'd have had to remap all the textures to the buildings that you editing. This of course is a time consuming process and I'd like to encourage you to keep up the good work.
Edit:
At up: That means you've made an error in putting the download into your game.
You might have to redownload MnB.