Does this idea sound crazy? After seeing someone using GW SpaceMarines as the Mobile Infantry from Starship Troopers, I got to thinking: What about a pulp-SF, Solar System only setting for WH40K figures? Aeldari for the more civilised Martians, Orks as Martian desert dwellers (well, they're green!) Idoneth Deepkin as underwater dwellers on Venus and/or Neptune, mabe T'au as tchnologically advanced Venusians, like the "Treens" from "Dan Dare", Votaans as asteroid miners?
Any thoughts?