I have messed around with that lilliput screen a few times for my scion tc. In all my installs I have removed the buttons off the screen and made the screen autopower using the remote. I have the screen on auto power for at least a year now and i rarely need to mess with the screen options.
I recently started extending the remote wire of the screen so that i can still use my remote. If you have a bit of a soldering skill like me, that would be a good option.
I would suggest getting rid of the buttons if the screen doesn't fit heightwise.
Also post a pic to give us some idea of your situation. if you messed up for frame you can always get a new one from http://www.digitalww.com/LH007.htm