Grande Cipollini!!!
[OT]
It reminds me of this test: Olympic Cyclist Vs. Toaster: Can He Power It? - YouTube
If that guy doesn’t bend frames on the daily I think we are safe 
[/OT]
The only real “flat” surface that I have ever seen is the cast table that I used in my welding classes, you could not weld ON it directly for obvious reasons, weighting at multiple thousands pounds, cast iron and then machined to be flat, it was donated to the welding club when the factory that commissioned it closed down. It was a pita to move.
It always struck me that a framebuilder is using flat surfaces and precise tools to measure everything and then a wheel is literally eyeballed for straightness, I mean, even the expensive wheel building tools are still not as precise as the micrometers and marble surfaces that many builder uses.