I was laying under the 914 the other day staring at the floor pan (hey...it was break time ), noting the simularities between my 914 and a VW bug I used to own. Had a little flashback to when I was a kid in my Dad's brand new '69 Beetle. We're cruising down the road in a bad-ass rain storm in Colorado and hit a flooded intersection. Friggin' car floated across the intersection past other stalled vehicles and out the other side. I remember how impressed and amused my Dad was that it actually floated. So, I'm thinking it wouldn't be all that difficult to convert one of these babies into a little two-seater runabout. As long as you could make the doors, longs., engine compartment and trunks water tight (or even foam filled), it should float (Note: all of my bouyancy calculations are WAGs, under the influence of several....okay..5 - 6 beers).
If I get REALLY bored, I just might try something like that with my non-roadworthy '75 (okay...now we need a "water skier" smilie)