Most of my bike have evolved based on ergonomics and riding preferences, fitness, budget, and experimentation. Nowadays, I pretty much know what I want and what will fit me and my riding style. So, I pretty much just make copies of the same thing with slightly different strengths.
The bike that got me serious in cycling again. This is how it looked immediately following the overhaul
New 7s wheels, pedals, bar, (wrong size) seat post, and saddle
New cockpit, tires, seat post, derailleurs, brakes, crankset and BB
When it became my second bike, I threw all my best parts on the new frame and built this one up with whatever I had around. Nearly every part was different by this time:
The last incarnation while in my possession: