The factory bezel is removable I believe.

I'm running a Pioneer AVIC HD1BT with DLS 3 way components up front and 2 Orion 10's in the boot. 2 JL Audio amps running everything and I originally had the full OE options of NAV and DSP. My friend did the headunit side of things and pretty sure he removed the bezel as opposed to cut it out. Will check with him tomorrow