Gave it a shot
Ok, got so excited after reading this thread at the possibility of having WUXGA on my MBP that I stopped by a friend's business. (he refurbishes Dell Laptops, always has everything as far as laptop parts are concerned...) Thanks Baxterbrittle - would have never thought it possible.
15.4" MBP. Popped it open, disassembled everything. I've pulled the body apart before, but never removed the display - getting the display out was a whole other experience - first LCD I've ever seen GLUED to the bezel!
Now, after all that, stripping one of the hinge screws (who needs threads anyway - stupid torx!?) we tried just about every display he had. We started with a WUXGA: it lit up, showed a blotchy pattern, and just kind of sat there. Rats. So we tried the next step down. (WSXGA, I think - yeah - 1680x1050) Lit up, but just kind of sat there. Confused, I tried connecting the MacBook to external video. Sure enough, it was booting. Intrigued, I popped into the monitors control panel. Saw the display, guessed the correct resolution. So I put the WUXGA back in, shampoo, rinse, repeat. Saw the display, set the resolution, and rebooted ... and...
BINGO!
Apple logo, spinning status, the works. I was psyched. The possibility of having a lovely 1920x1200 display coursing through my veins. Jumping about, doing a dance. It was great. Until...
Damn. As soon as it got past the Apple logo and started booting the OS, it went blank. Rats. Double rats.
Booted into single user, and the damn thing works perfectly. Text fills the screen, everything displays in ultra high-resolution goodness. Once it gets to graphical mode in OSX however, it goes blank. The machine is still running, the display is still lit, but it just goes grey. The display is seen in the Monitors control panel, but nothing.
I've read through this entire thread, hoping that someone has solved this little riddle - it seems that once everything gets past EFI, OSX somehow doesn't know what to do with the display.
So, I ask everyone - any suggestions? Not afraid of cracking this open again and giving it another shot - I've been teased by the boot screen, and now my spinning Apple just looks huge.

If we can figure this out together, my friend here has dozens of these displays - and I know he'll be better on the price then fighting on e-bay for 'em.
Would love suggestions - drop me a line - I'd love to be a beta for your ideas.
Edit: forgot to mention - yes, the displays just fit in. You would have to trim the tabs that Dell (or other makers) add to the display casing, but yes, the screws all match up, and the displays are pretty much identical. There are only three or so makers of these LCDs, so they are pretty standard. We tried with a Sharp and a Samsung - both worked up until graphical mode in OSX. Wireless card & isight remain the same. (BTW - never thought a camera could be so tiny - was afraid I'd break it - impressive!)