I'm sorry but you bring absolutely zero evidence that these formations [crop circles] are man-made at all. Huge flaw in your thinking - you are assuming that the reason for the crop circle being built in stages is due to 'their' technical limitations.

What if the reason for the delay is to hold our attention? A familiar plot development motif is to provide suspense, and not put all your eggs in one basket as it were. If they are aliens behind it, they will know we are watching - they have a captive audience waiting for the next instalment.

The only way you can prove your hypothesis is to simply go out there and snap photographs of them caught in the act. Instead, the field reports on this particular crop circle point towards alternative explanations. We have orange lights in the sky caught on camera. Check out the field reports at cropcircleconnector.com. We have evidence of stretched and bent nodes. I would argue that we have tons more evidence of ET activity than we do of people coming in with boards strapped to their feet!