Looks great - LEDs inside would help a bunch and not add any heat or noise. I'd tuck the Cap under there too or remove it all together as they really do not add much if any to the system - if you don't have a strong alternator and battery, it is a band aid at best.
We just finished a number of competition vehicles for the TX Heatwave and NONE of them or the competitors had Caps. I'm running 2200 watts in the ML and with 1/0 wire and a yellow top and I have no dimming or problems.