Wow, if you adapted some of the better parts from os:s like Freebsd,

such as memory management and File system....... you would have one hell of a fast system with a very common user interface..

that would be very impressive...

Send an official letter to Microsoft, and ask them bluntly a) if they intend to sue you in the future, b) what they suggest YOU should do for avoiding legal confrontation this is a serious suggestion, i am not joking. They will have to answer eventually, and their answer will give you an advantage i...