First go at rust repair w/pics + questions

[Smallz72project]

When I purchased my 67, I knew there was rust in the general areas and would need some repair. It was rusted through on the pass. side firewall next to the door and I decided I should fix that first before the clip goes on...but now after this...plans have changed and the cab is coming off for more thorough repair.



This is my first time attempting to repair rust, although I know how to fabricate and weld sufficiently enough. Started by cutting an opening to rid the cancer and clean out the crap that was causing it.



Once I had it open and cleaned out I could see that I had more damage then I was expecting. The metal surrounding the vent was rusted and I was able to poke through it. I cut the metal I had laying around to fit the hole and started to lay down the tack welds, all was fine and dandy until I hit the edge of my repair...the metal was too thin from all the rust that it kept blowing through, so I am going to go back in and cut out my repair plus some and redo it.






My first question is...I want to clean up the engine bay and have been looking for a under dash heater and can not find just a heater. Does anyone have a link or name of a company that would have one? I know vintage air does underdash systems but thats for air conditioning/heater units. I dont need or want air conditioning. If I can locate a heater only underdash unit I want to cut out the vent door completely and weld in a solid kicker panel and also the heater holes on the firewall and the cowl so no more crap will fall down and get trapped. In the picture below...the yellow circle is the area of the kick panel thats rusted and Im thinking about sealing up. My second question is where the green circle comes into play....any one know what this knob is??