Just finished my first antweight yesterday, Anty-Clockwise. I built this for my university's Roboteer's society, since we can't really run anything bigger given our budget and safety restrictions. Took me about a month, including CAD and waiting for parts. Made mostly from 1.5mm HDPE, 1.5mm polycarbonate, and 5mm HDPE bulkheads. Uses Rory Mangles' NanoTwo V2 ESC and a brushless motor and ESC from Hobbyking, with a 2s 180mAh lipo powering it all. The spinning blade on the front is 40mm in diameter, and is made of 3mm stainless steel, weighing around 15g. I have yet to measure its RPM. In this test video, it's running at around 50% power:

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I'm working on designs for a Mk II with a bigger blade (more than twice the weight) and invert-able construction, but I'm not sure when I'll finish it.