I don't think anyone stole anything because this is Open Source project.
Price is usually a good indicator for parts used and China is infamous for using poor quality parts or even fake parts and scam you. [
www.sparkfun.com]
I went and built one from scratch. Sourcing parts from local hardware stores and eBay. Very nice project, but has more work like making the wiring loom yourself. (All the wires are either too short or too long and have different connectors or no connectors at all..
)
I think buying a kit might be easier to build?
Just buy a kit made from metal frame and work your way from there, i think?