Here are all my modifications to my smoker setup.
First, here's the PID controller enclosure I built. I can plug the smoke generator and circulation fan I installed into one outlet and the other outlet for the heating element is controlled by the PID/SSR. It's 95% finished. I'm just waiting on a drill bit to drill a hole so I can mount the thermocouple jack in place.

Here, you can see the Auber Instruments circulation fan mount that I installed last night.

Inside the cabinet, you can see the circulation fan about the 900W heating element. Since it runs a lot hotter than the original 500W element, I added a heat shield to protect the insulated area right behind the element. I also switched out the 2-inch bolts with 2.5-inch bolts to create some extra space between the heating element and the back wall.

With the back panel removed, you can see the black spot behind the heating element located inside the cabinet. While it was a bit dark before I installed the new heating element, it got significantly darker after the initial cook with the new element, so I thought it was prudent to add the heat shield. I also changed the wires to 14 gauge wires.

I mounted my thermocouple inside the top right corner of the cabinet. I also mounted a temperature probe beside the thermocouple for my ThermoPro dual-probe meat thermometer.

I have the thermocouple wire and jack hanging out the bottom of the back panel till I get the drill bit I need to create the mounting hole. The screws on either side of the wire are loose to avoid damaging the thermocouple wire.

I have a similar situation going on with the temperature probe, but it's hanging off to the side. I picked up a rubber grommet today that I'll install along with the thermocouple jack.

I'm still waiting on my replacement door seal, so here's my temporary fix. I just added a bead of silicone along the top left corner of the cabinet. It's ugly, but there's a lot less smoke leakage from the cabinet. Can't wait to rip that off when the new door seal arrives.

So those are my modifications to my cabinet. A couple of more drilled holes and it's done.