to the subwoofer guys.. look into the pioneer spare tire mounted subwoofer.. its universal meant for regular sized spare tires.. im almost positive it would fit in ours.. only mod needed for that is i think a longer bolt to hold the spare into place.. shouldnt be too hard (ive never seen one personally.. just heard about them installed in other cars)
other than that im pretty sure that ive seen one mounted in a spare tire custom... cant remember where i saw it though..
and i would agree with the consensus here.. removing the panels is pretty easy if u get the panel removing tool and take your time (make sure to use some heat or a hot day or your plastic will be brittle) putting them back in is what sucks.. so do most of the work yourself then if you really cant get something back on go to a good install place and offer them a reasonable amount to put the panels back on for you