Quick update regarding my ebay conquest. Well, I guess everybody messes up from time to time and this time it was me. Ironically I stated how easy changing out a backlight would be but believe it or not I completely destroyed the display assembly while trying to disassemble it even though I took my time and had the proper tools for the job. I was amazed to see how difficult it is to release the back bezel from the display assembly and let alone trying to remove the LCD itself from the front bezel. I don't know what sadists put and glued that screen together like this but separating it was an impossible job. Eventually the screen developed black stains and cracked lines so at that point I know it can't get any worse. Also, I managed to pierce antennas and damage the plastic rim. Long story short, the entire upper portion of the laptop is pretty much trashed which kind of breaks my heart but what can you do. Please do note that I sucessfully and without any damages did the same job three times with 15" PowerBooks. I even disassembled the LCD sheets from one of my 15" PowerBook in order to get out some dust which I was able to do without any problems. I definitely felt skilled enough to do the same with the 17" PowerBook but as it turned out this is a whole other beast.
Since I literally do not have any display to work with anymore, there is a change of planes. I will keep the rest of the laptop (which is already cleaned and disassembled, without damages and in pretty neat condition that is) as a spare for my A1107 which is a custom semi DLSD (I put a screen from an A1139 onto it). Many parts between the 17" PowerBook line are interchangeable between each other so I at least have spares. Also I have a semi-working battery and another charger. So my 19€ (even without a display) were wisely spent.
Just imagine my mistake in the year 2004, I would probably have thrown 1000€ down the drain by messing up this kind of repair but nowadays considering the price I paid it is more like 5€ of financial loss. Still, I'll keep watching for a 17" display assembly (and yes the entire assembly and not LCD alone, I won't try that surgery again on a 17" machine). I know I'll find a suitable donor display assembly eventually and once I have, I'll build another 17" one.