The commands boundingBox and boundingBoxReal are returning excessive boxes, up to the point where I can as well just take a wild guess. Chances are my box will be a better guess/match. :/

If boundingBox returns a box that includes some kind of spacing/margin by design, then that's fine, I guess. But boundingBoxReal has to return an *optimal* box (where the optimum is the minimum) - anything else is not usefull. At all.
If you're funny, introduce a new command: boundingBoxRealForReal. 8)

And secondly (minor problem): Please make it so that these commands can just take a class (string). Currently they need an object (present in the world), which kind of defeates the purpose of retrieving the bbox first (e.g. in order to find a suitable place). Sure, we can spawn stuff first somewhere else and delete (or reposition) it afterwards. But that's just a hassle, considering the bounding box of an object is *static*. And recalculating the bounding box at runtime seems to be wasteful anyways (say from a performance point of view; memory is cheap).