You should have no problems coming up with such a system. By placing the IR panels on rails, you should be able to adjust for the parts with no problems. Remember, IR can be tricky with powder. In one application we had with IR, we cured and BURNT OFF the powder from bake calipers all within...
We have powdercoated a great deal of glass. No problem! Simply preheat the glass to 300F for about 7 minutes, powder coat and cure.
We have coated: christmas tree ornaments, clay pots, bottles and more.
There is a great site with free powder coating info at: TechnicalHelp4U.com
Yes, there are some great fillers available for use in powder coatings. Some of these are good for up to 1000F! I found a great powder coating site with free info on it at TechnicalHelp4U.com