Ok Guys, I have ordered some extra bits:
1. 5 metre (about 16 feet) monitor interconnect cable $35
2. 2 x ribbon cables to extend the buttons on the front of the case $21 each.
So The monitor controller box will sit behind my back seat witrh all the rest of the PC stuff: see my worklog here:
Hopefully I will be able to exend the button cable with a soldering iron... wish me luck.
I ordered the monitor and the bits above from Richard at http://www.customcarputers.com and received excellent service as his international freight was cheaper than Xernac Direct and I could get some other bits and pieces in the one order.