Okay. If that's the case probably what I'd suggest is going to iFixit, browsing their take-apart/repair guides, and following one just remove the top case. (The instructions for that are in most of the more in-depth items, like changing the logic board) and once it's off seeing if you can gently convince some of the dents that are actually affecting things (like the one that's preventing PCMCIA cards from ejecting) to straighten out. (While you're in there you might be able to see if there's a cracked piece of plastic or popped-off metal bit on the lid that can be mended with superglue/etc. to firm up the palmrest.) Again, I would just exercise caution because the aluminum shell (in my limited experience) doesn't take well to being forced back into shape; if a dent is really just cosmetic and/or it would require a ton of disassembly to give you the access you need to push it out you might just want to let it go. I'd really make the priority firming up the palmrest, if it's separated enough to be annoying. There really isn't any way you're going to make it look like new again short of replacing the damaged chassis pieces with new ones anyway. When this material is dented it irreversibly stretches the metal so even if you could perfectly push out an inward dent it'd just create a rippled bubble in its place.

They used to sell these snap-on plastic covers for the 17" Powerbooks; personally I'm not at all fond of them because the thickness of the plastic reduces the angle to which you can open the screen, but if you could find one as old-stock you could cover up the damage with one of those. (Assuming the PB isn't so bent the cover will have trouble snapping on.) Or just embrace the "road warrior" thing and cover the worst blemishes with holograms and bumper stickers.