I think I decided how I am going to make this happen. I am going to line the trunk lid with fiberglass and mount it to the deck lid. I will bondo two flat areas so I can mount my amplifiers to them and run all of the wiring. I will build an MDF rectangle around each amp and then make a second layer over the MDF so the ams are flush with that layer and all the wiring will be sandwiched between the two layers. Then sand and finish with carpet.