Since losing my bike to a thief I turned to my "spinning class" bike to become my road bike. I think it qualifies as a true "Frankenstein" bike. I bought the frame, fork and seat post on E-bay a couple years ago for just over $300.00. It is a 2006 Specialized S-Works Tarmac Matrix - 60 CM. This is the frame that Specialized had that is part E-5 aluminum and part Carbon fiber. The parts are listed below. Most came from E-bay and some came from my brother's collection of parts.
Stem - Felt ST-27 - E-Bay
Handlebar - Bontrager Race Lite - E-Bay
Handlebar tape - I have no idea what it is.
Water bottle holders - came off a bike I crashed a couple years ago.
Seat bag - found in a box of bike parts I have.
Seat - Selle Italia - Model is worn off so I cannot read. Came with a used bike I bought 5 years ago.
Speedometer - Cateye Wireless I just bought and installed.
Pedals - an old set of Ultegra pedals that came off an older bike. Thought they were worn out then.
Shifters - 9 speed Dura-Ace 7700. These were in my brother's shop. Got them in trade for a bike part to be named later.
Crankset - Shimano FC-R700. This is a crankset that is not part of a Shimano group. Not sure why I had the set. 50/34
Cassette - 12-27 9-speed from E-Bay
FD - A new Ultegra front derailluer
RD - Dura-Ace 9-speed from E-Bay
Brakes - Shimano 105 - Not sure how they arrived.
Cables - Found in my brother's shop.
Wheels - A brand new purchase. Stan's No Tubes - Alpha 340 ztr
Tires - A set of Maxis Pardrone - bought with the wheels.

The wheels and tires cost more than the rest of the bike.

I believe this qualifies as a "Frankenstein" bike. And has qualfied as a lot of fun to put together.