It's Unix based, so ...

[csrgxtu]

according the intro, this project's operating system is Unix based.
since Unix is already an Operating system which manages all kinds of hardware and provide interface for upper application, so can i think this project is writing a application upon the Unix?

[aswinmohanme]

Nop.

It's based on Unix principles. The course aims to develop an Operating System from scratch, that could interface witht the hardware and run user space programs.