You found it! The fit between MDF and PVC is very tight, the underneath of the unit is also Bondo'd flush with the underneath of the CP panel. The downside to this is that if any LEDS fail..I gotta dig the whole thing out (which isn't happening). This may not be the only CP I ever build for this machine. The LED brightness should be toned right down for actual play, just a nice subtle diffused glow. Glowing inserts under various controls is part of the overall Retro-future theme of this cab. I think the trick to attempting this is finding thick PVC material to adequatley diffuse the LED light to a single glow. Soft semi opaque PVC is perfect for this.