Modular renovation

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1.) Should I replace the insulation in the wall spaces? Some if the insulation is discolored (black)in a few places. I'm not sure what caused that but suspect moisture. The insulation is dry.

Discolored insulation is probably from air leaks. Insulation should still perform. Add a vapor barrier before applying drywall.

Also, I have a 6 inch gap between the underside insulation and the floor. (The height of the floor joists). Should I insulate this space? IF so, to what depth? Should I completely fill the space?

Insulation may be beneficial, but be sure it is adequately supported.

3.) I plan on paneling or putting up drywall. Should I place a sheet of plastic between the interior wall and the insulation to serve as a vapor barrier?

Yes

4.)Through the course of removing the floor and paneling, the vapor barrier coating on the floor insulation has been punctured in quite a few places. I am concerned I may have compromised the vapor barrier. Should I repair the punctures? I was thinking duct tape might do the trick. The largest is 3x5 inches. (Major OOPS on that one).

The easiest solution is to use spray adhesive like 3M Super 77 and patch with plastic.

5.) Short of replacing the entire walls, how can I remove the smell? I've saturated the areas with bleach 3 times. The odor diminishes with each application but I worry I may be damaging the wood. Any ideas?

Kilz original primer or Zinsser BIN. Both are stain and odor blocking. I have used them successfully in this application.

6.) In the course of drilling the floor out between the bottom of the walls and the floor joists, I've punctured the outside metal siding in a few places. What should I use to patch the holes?

Not my expertise. 2-part body filler (bondo) comes to mind, or fiberglass mesh with resin can be molded over the gap. Final smoothing and filling with glazing compound.

Hope this helps. Good luck.