OK, I'm pretty sure you didn't actually mount subwoofers behind your front grille?
so maybe they're bad-ass horns? (UFO collectors? Radar jammers? Hey, may as well be creative, as long as I'm guessing in the dark.)
Love the finish you're getting, making it look all brand new. It's too soon to know, but I'll be curious if you ever look back on the Rustoleum decision and wish you had sprung for the POR-15 instead. After all this time spent on labor, a few extra $ might not be as significant as it feels now? for something that reportedly lasts pretty much forever. I've seen it hold up remarkably well in a tough environment (near the ocean), though I've no personal experience with long-term automotive use. Yet.
Don't worry about how long a project takes. Some guys can crank out this type of work in a few weeks, while others of us balance play/work/family in different proportions. As you take your time making it exactly the way you want it, you are in good company. Besides, you're doing more car stuff than I am right now? I'm envious that you have workshop space! (Beats needing to move a project every other week for street sweeping, eh?)
Cheers!