Great Stuff as always Lorenzo ! :cheers
I'm a bit curious as to how you tackled the casting of the flame box? This was a particular hassle when I was considering options. The reason I ask, is that in one of the pics you posted, I see a two part mold "part line" or "seam" that goes all the way around the middle of the box (lengthways). In my own experience, this will create an issue on the final casting for your "cold cast" versions when you get around to them. Obviously, not on the standard gel coat versions because there is no finish to speak of and gets sanded for primer anyway. But I would recommend trying to avoid having to sand any "seams" on your "cold cast" versions, as it will ruin the "virgin" layer of aluminum that settles toward the surface of the mold in the process (it's the shiniest when buffed after curing). This would mean that you might have to revisit how you made the mold for the flame box. Just a thought, or helpful suggestion. If you're interested in my solution if you don't already have one, hit me with a PM and I'll help you out in any way I can 
Again, VERy nice work my friend :cheers
FP