whats broken on the mogul that you bought from ebay? if the housing and screen are good top half of the device ... I would just take the top half from yours off and replace with the top half of the one you bought... even if screen on ebay one is broken you can still just replace ebay top half over yours just keep your screen connected.
There is a video this girl did on youtube try starting there she has a good breakdown of the process and walks you through it as she does it herself.
She is taking it apart to swap her sprint mogul into a black alltell housing.
http://www.youtube.com/results?searc...ype=&aq=-1&oq= its three parts to the video i would start with part 1 LOL