Great work. What kind of paint did you use to coat the inside of your box? How did you apply it, spray or brush, or something else? Are there certain types of paint I cannot use? I definitaly wouldn't want anything that is heat sensitive or degrades in high heat.
Warhammer 40k paint is made for applying to metal. This would be my first guess, albeit a terrible one.
So what IS the skinny on painting?
P.S. Would you be willing to supply some pics of the dremel'ed out area? I'm curious to see the other angle you're not showing us. I understand if it's your secret, though =)