On this picture

I hope you only use this connector (the
yellow one that touch the letter
"A" in EPIA) just for test purpose. I would recommended you put an in-line fuse there instead of the connector.
Putting the monitor where the "double door" is a good idea to keep thing hidden, but it may be too low. Check to see how it view from the driver seat. If not, you can relocate the radio down there and have the monitor up where the radio is.
There is one 03 Rolla install in this forum. I remember the guy paint every "removable" interior plastic
RED