I find the mounting of the knife and light to be silly, and they make shooting difficult as the mount partially blocks the sight bead. I'd rather carry either or both on my person, not my shotgun.
Pistol grip pumps aren't cool in the movies, not in real life. They catch on everything, break off, and hurt you if you ever make the mistake of holding it while shooting. Better would be a fabricated double chamber pump, out of say PVC.
I'm surprised he didn't work more with the stock. Particularly the width. You can put quite a bit into it, especially if it's widened on one side.
Clever saw blade mounting idea.