ho, you are dead on with your recommendations about the cabinet. I did exactly as you stated with my cabinet and it made all the difference in the world.

Before sealing the seams the media went everywhere. Using the shop vac made inside the cabinet easier to see when blasting. Installing the new light also made a HUGE difference! The only thing I did not do was the ground wire, never thought of that.

Once those mods are made to the cabinet from Harbor Freight it worked perfectly and effectively. I ended up selling mine just before we moved, I had also JUST purchased and filled the parts cleaner that I bought from there just prior to the move and that thing worked great!

I have a 12x25 concrete pad next to my single car garage. Although it is open to the elements I am going to epoxy paint the pad and set up an outdoor type work area. I'm thinking of maybe buying a steel roof type thing to keep the sun/rain off the car and the work area.