Looks nice, have you noticed that it helps? (The fans?)
I had a similar problem with mine, Lately Denver has seen near record high temps, and the amp is in the trunk with no A/C. My amp (and most) has a temp protect circuit, so if it gets hot, it cuts out, and comes back on when temps decrease. Quickly the amp would turn off and on after maybe 10 minutes of music, and it became very annoying (not to mention the extra wear possibility...) so I got a pair of fans and made a pedestal of sorts for it. Basically the amp is on top of the "box" yet, the box only has four of the six sides, the bottom and left and right are MDF, the amp is the top piece, and the front and back are open for ventilation. This helped, but hasn't completely solved the problem, it doesn't cut out often, but when it does, it's just as annoying. I end up folding forward the seat back, and letting the A/C flow into the trunk, and the hot air out.
I may change the design so the fans blow onto the amp's heatsink instead, maybe that will help...
Any work on the other side sub enclosure?