How much does it take to run FreeBSD ELFs?

[megastallman]

Hi Guys!
Thanks for that great project you've implemented!
I've seen you are using your own userspace ELF loader. So the question is, if it is possible, within the same architecture to load FreeBSD ELF files too, map to FreeBSD ELF sections, rewrite syscalls implementations(since it is already done for some Linux syscalls) and run the binary? Wouldn't it take something like rewriting the whole project from scratch?