I'd also recommend going with a good pair of component 6 1/2s in the rear deck. But if you really want to use those 6x9s in the rear deck, there aren't many electronics on the deck lid since you'll be removing the stock amp anyway leaving just the trunk light. (and a whole bunch of metal) Or you could put the 6x9s in the front door panels instead...
If you start cutting out that metal on the trunk lid, I haven't looked at it, but the thought came to my mind that it might be a structural part of the car. If it is a small part of the rigidity, and you really want those 6x9s in the deck lid, get a rear strut bar to compensate and even improve your chassis rigidity.
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