I considered both points, area terrain and battle mats. I'm going to go without basing precisely because of the battle mat reasoning. Most of my buildings are going to be be dilapidated with vegetation which would fit in multiple environments (except frigid/arctic) so having no bases would make them stand out nicely and not look out of place.
I brought up Inquisitor 28 because I've been looking for a set of rules that some friends and I can play that would also allow for the greatest variety in units within warbands but also not necessarily restricted by army. I kind of want to replicate the variety seen in the Pilgrym game/story that John Blanche was involved in. I've looked at Necromunda, Necromunda Community Edition, Shadow War: Armageddon, and I'm even thinking about using Infinity or Genesys Project as a rule set. Different game, but using Warhammer miniatures for practical reasons.
Infinity looks to be the most promising because not only are the rules fantastic but you can field anything from lightly armored grunts (analogous to Guardsmen), power armored shock troops (Space Marines), drop troops (Assault Marines), mecha of sorts (Tau battle suits), or ninjas (Reivers maybe, Sicarian Infiltrators) in the same list. I guess that could make things overly complicated so we may do a couple games of SW:A just to get everyone's feet wet when it comes to mini wargaming.