Not an interesting project.
the MC68000 has no way to restart an instruction and no MMU.
Both of these are critical to running a Linux kernel today!
You could emulate a 68000 on a Beaglebone Black and have
it run faster.
*nix like OS have been built and run on a 68000 Idris is one
historic port of Unix. Little or no protection to keep processes
from running over memory and I/O and doing bad things but a
worthy *nix all in all for its day.
Step up a little to the MC68010 add an external TLB/MMU built
from modest size fast static RAM and Bob's yer Uncle... A
68010 does have the ability to restart instructions so you can recover
from a page fault. An external TLB/MMU is easy and designs
abound in 25+ year old paper documents.
When you are done a Raspberry-Pi or Beaglebone Black will still
run circles around it.
If you want to have fun build yourself a machine like the "magic 1"
and you will learn what all the buzz be about.