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.

you can work on HURD, since that is a microkernel instead of a monolithic kernel like Linux or BSD you can work on just one module.

Also instead of working on the Linux kernel it might be more productive if you just made your own distro and used Lisp as a scripting language to handle OS tasks within the distro.