Phroosh,
That's kind of why I was leaning towards leaving them out. The interior with the seats and ammo racks shows how cramped it really was and I'm thinking the figures would detract from the detail rather than add to it.
It's going into a wall case, which means it won't be easily seen from the top anyway, but is also destined once completed for inclusion in a local model contest/exhibition, so it's a tossup.
Here's the case (and because of the mirror background, me) in the office/workbench area. It will go in on the lower level next to the Hummel.