I have done a few, definately fun and everything can be hidden under the factory grills. I would suggest that you invest in a EQ/Time delay unit such as the Audison BIT ONE or Rockford 360.2
Personally I would keep everything intact and just replace the front speakers and add the sub.
My preference would be
Hertz Audio Space 8 midbass and 1" Space tweeter in the door off the Audison LRX5.1k with a Hertz Mille 10" sub in the rear left corner.
Everything can be hidden behind the factory panels but the sub will need a new grill, you keep the factory compartment cover, that way nothing is cut up or holes drilled.
Also the above system is a complete drop in, again nothing being cut.
Factory Head unit out to the Bit1 then out to the rest of the system from there.
I know for a fact that this would sound phenomenal also! (remove mic input to Bose amp)
http://www.northolmstedperformance.c...he1&Itemid=208