Writing an entire OS?

Has anyone here ever writen an entire OS, or thought about writing one? I planing to write one from scratch in lisp based on the linux kernel. Im kind of tired on of unix like systems and windows is buggy crap too.

>>2
you misunderstood me: i said im tired of unix like OSes and that windows is buggy.

And i will use the linux kernel as kernel and write my own userland, i will just write a interpreter and then execute lisp scripts using the interpreter.
Linux automaticly feeds files that start with #! to the the coresponding interpreter.
Maybe i will write it one day to run on other kernels as well.