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.

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Im going make a a syscall function which uses int 0x80h, so it should be compatible with allmost all unix like kernels.

Then im gonna write high level system interfaces in lisp using this function.

So choosing a kernel should not be that big of a problem.