Numerous questions about where to buy, how much it costs and how long to build:
I bought a basic kit from starbeegyros.com in 2012. All parts were made from materials that were cut to size, drilled, processed and so on. The rest was acquired as needed.
All aluminum pipes is 6061t6, steel parts is 4130, bolts AN.
I can´t say how much because I built patiently (about 3 years). I bought many parts in England, France, Germany, USA, Russia, Ukraine, Spain. Turning and milling work are expensive and difficult to find, who could do it..
The final cost largely depends on the availability of turning and milling machines and free time.
At that time, I could buy a readymade set (without rotor, engine, instruments), but much more expensive. I decided that I would do it myself, so I bought a basic set, and bought all the other parts as soon as my project was ready.
I tried to capture the stepbystep process of creation in the photos that I took at each stage. Then I made this video out of them. Building process:    • Gyrobee gyroplane, homemade step by step  
I described the whole construction process in detail in my blog: rotorpt.blogspot.com (in russian)
I downloaded the drawings for free on the Internet, the keywords are Gyrobee by Ralph Taggart.
Many thanks to Alexander Lameko (aka. ABM) for the translation of the drawings into Russian, and subsequent consultations on the construction.