I'd read through all of Erik Naggum's posts in Xach's archive several years ago, but revisiting one of them today.
A choice quote at the end:
> if you really want to implement your own language, implement Scheme. if you really want to use a good language, choose Common LIsp.
> corollary: implement Scheme in Common Lisp.
So Airship Scheme is headed in the right direction!