>I've rolled two VW's in my life.  In 1968, I owned a 62 Beetle going 55mph
>on a lightly snow covered 4 lane road swerving from right lane to left to
>avoiid rear ending a slow poke turning right at the intersection.  Tires
>broke loose, I whacked the median curb, and the beetle rolled 5 times for
>a total of 175 feet.  The roof wasn't caved down any further
>than  shoulder high.  Never mind I had gasoline on me from the tank
>springing a leak!.  Slight scrapes but no other  damage to me.  Fast
>forward 5 years to 1973 and an old rust bucket 64 Ghia I had went around a
>sharp 2 lane highway curve too fast and popped the tire bead off and in to
>the ditch I went at maybe 40 mph.  This car rolled 180 degrees and the
>roof was on top of the seats.  I had to kick out the rear window to free
>myself.  Never owned another Ghia after that.

PS  Glad you're okay, and glad I survived, too.  To answer your question,
TDI swap is possible and has been done.  Someone on the list will steer you
towards the guy that does it professionally.

Max

>PS   NB is a very safe car. I missed a turn in the rain at 75 mph, went
>over the concrete barrier,  and rolled down a bank onto some railroad
>tracks. Car is history, but  I was unhurt. It rolled somewhat like a
>jelly bean.
>