lol, i am loving the sounds of this one. I know you've got the engine front sorted, but I believe that there is a well-tried/tested and reliable turbo conversion for the cinq. out there - so bigger uninterupted power is possible.
keep us posted!
Pics will be posted as soon as I get the Cinq past my wife and into the back garden - its currently hiding at a mates place...
I stumbled across an original Beetle with WRX running gear a while back. That could be fun, espcially on original Beetle tyres!
 found it: http://homepage.eircom.net/~veewrx/index.html [/edit]