I had planned on doing this to my 52 and got as far as buying all the internals (metal channel, window frame, felt kit, etc), but am now thinking of just using the vent windows.
All in all the conversion doesn't seem like it would be too hard. Mount the metal channel in the doors and remove any tabs/mounting points that were used for the vent window assembly. Window regulator should bolt right in with the exception of the slide rail thing. Still don't know if I'm brave enough to try it. I'd hate to ruin my doors.
