Not sure what the level of tinkering is for a proper Frankenbike. But here are some that should qualify:
Trek 620 with flatbars and Nexus hub
GT Outback. Fixed with fenders and studs. Best snow bike evar.
Rockhopper. Powdercoated black and fixed. Fenders and big slicks. Yes, it has been Drewed.
Surly Karate Monkey. Not C&V. But the 24" rear/29er front has to count.
Stumpjumper. Modern 1x9 drivetrain. Biggest Big Apples money can buy. This thing is a sweet little tank.
jim
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Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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SB forever