Just an idea

I saw someone I follow on Instagram post Legions Imperialis tanks on square flat bases. I really like the idea of vehicles on bases because then you can have them all in the same environment. I thought about using the official round bases, but the smallest you can get is 40mm which is a bit too big (I dislike the 'overhang' where the sides of the base are basically empty and taking up space). So I might make them out of movement trays which you can get for Old World. Not sure if I'd want to rebase the thunderhawk though, as I think that has to be on a round. I'll texture it anyway so they all match.