It's not that uncommon a thing to do. Jens Wendorff did it on this board (I think from a Carrera) and it looks great. You get galvanized steel, brake, suspension and power upgrades, and you even get to avoid having to repair or replace the cardboard map pockets.
On the other hand, the bodywork and paint isn't cheap, and you get a slightly heavier (but safer) car. You just have to decide what point you're going to want to end up at, and if there's a single model that's closest to it. In my case, my brakes (930), suspension (21mm/30mm torsion bars, 22mm swaybars, 74 aluminum trailing arms), engine (964) and transaxle (early 911) simply couldn't be found on a single newer car. I would still have had to replace it all to get the version of 911 that I wanted.
But I've seen it done, and it looks great to loose the clunky bumpers and get something closer to the RS look. I haven't seen it done to a 964, but I don't see what would be so difficult about it.
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Jack Olsen
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[This message has been edited by JackOlsen (edited 09-05-2001).]