Most impressive, despite the issues you had with it. It certainly looks far better than the two that I built! I just might have to start a third one just to make it better than the first two. One suggestion for your paint, particularly the basecoat and any other solid camo colors: thin it down a bit, almost to the consistency of milk. Then paint it on and let dry. You will see a lot of thin spots, but don't worry. When it is dry, paint it again using the same consistency. It will slowly fill in all thin spot over the course of three to four coats and will look closer to airbrushed on. This takes more time, but it does look more improved.
When it comes to seams and sanding; if you wet-sand, the dust remains in the water/moisture and is far easier to clean up. Otherwise, try to have a fan behind you blowing the dust out an open window if possible. That's what I do, along with a dust mask. Just some ideas from me for the next ones. Now I'll be following along with your other Threads since it's always a thrill to see your work.
Keep 'em coming Doc!