freebsd layered with chez-scheme

[Mayuresh Kathe]

would my understanding of systems (as below) be right?

there's the freebsd kernel which is layered upon with the libc
and other supporting libraries like libm.
this combination is layered upon with the userland with code
in place to provide security?

given the above, would i be right in assuming that a similar
setup can be used, say with something like chez-scheme to
provide the userland?

so essentially, the kernel would be layered with the libraries,
which would support chez-scheme running in multi-threaded mode.
then the rest of the userland would be a set of scheme programs.

obviously, that would not be unix due to it's non-posix nature
as well as difference in philosophy, but it could be the start
of something new.

~mayuresh