I have made about a dozen of the undecorated ones. I strongly recommend this kit over the Athearn version. This one is just so much more accurate right out of the box. There really isn't much for you to do to it other than weather it. The Fallen Flags kits did not come with consolidated decals, so you will need to add those. Check a photo to be sure about placement. There is no need to do any body work on these kits, just assemble and weather them.
Below is a Dean Heacock pic of the real deal.
Below are pics of mine.