There is nothing that I could say except: mod on! Just one warning though. Since powder coating is usually cured at around 200° C you'd want to check the temperature rating for your filler material since I've seen some projects suffer because inadequate filler material was used. It melted partially during the powder coating curing process creating "tears" around the fill-in plate. (Or you can try baking a sample in your oven, which can have consequences... for the oven that is . ) Cheers!