they are pretty stable, though. and each shelf does hold ~13 lb, so it's good for easily 3 FS/shelf, unless they're really huge or heavy.
i haven't seen--short of gonzo custom rooms--a cheaper & more effective way to display these easily & safely.
the cubes get really pricey if you elect for bigger than 12x12 & they don't have a front to keep out dust; more "furniture-y" cases obstruct too much, imo, or don't give the statues room enough for interesting displays (shelves are too shallow, too close together, etc).
there're a few diff't collections that have been posted here & other places. i think a collector called "TigerTank" has a GREAT set-up using detolfs as well as other cases, that includes comics covers in a great, effective way, too.