Both forces look great. Im more partial to the orks these days, but I would have had more interest in the marines back in the day.
I have plans to play/replay some of the old published 40K scenarios including this one soonish, but nothing is locked down just yet. I will keep an eye here for the undoubtedly inspirational ruined space-farm terrain to come though.
You may know already, but BatF was rewritten and revised into a mini campaign for modern 40k in White Dwarf for some anniversary or other back in the 2000s. Regardless of what system you plan to use to play the scenario, it might be fun to take a look at that to expand it out if you feel inclined.