For me this what you are using is Multitos.
Well not exactly Multitos but only difference
is that you are using newer kernel and nAES
instead AES4.1. MiNT is derivate of UNIX so
you need unix like filesystem as minix or
ext2. I sugest you to make at least 200 MB
ext2 partition to instal basic setup of MiNT.
I think basic setup needs from 20-50 MB of
diskspace and if you want to instal some more
unix, X11 applications then you need some
more diskspace. Best way to instal MiNT is to
use EasyMiNT distribution.