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.

>>3
Well, there's also a bunch of other old abandoned Lisp OSes which are open source (pre-Genera), which were made for the Lisp Machines. Some of those might be interesting to port, altough there exist emulators for running them already.