Did a quick Photoshop just to give you all an idea of what i want to achieve.
I want shorten the length of the body in order to give a kind of Coup look with a smaller rear quarter window. I'm going to remove about 4inches from the roof, not excessive by any means but I think it will look proportion and not too flat. I plan on removing the 'B' pillar completely and installing a retractable window frame so I can have both front and rear side windows working on electric motors. Also, my sitting position is going to be a little back than normal as i'm going to lose the front bulk head so in effect i'll probably be looking out the rear side window more than usual!