Any stationary object is easy to use this way. A ship is no different than a building. This is the idea I'm mulling, the creation of an object that be put anywhere, which of course means beside or even inside any non-moving object. No issue there.
The placement of such an object bears consideration. If located inside the collision box of another larger object, the outer object will be taking the initial blows. I'm not sure about how the blast and/or splinters from explosive ordnance (cannon shells, bombs, rockets) is treated where another collision box is inside an outer collision box. Do both collision boxes take the blast/splinters at all times (as long as both are within range, of course)?
For purely kinetic ordnance (non-explosive bullets), does the outer box require to first be 'pierced' via destruction? For some number of objects the dead mesh has a collision box also, sometimes identical to that for the undamaged mesh. Does this new collision box then impose the same 'shield' of protection?
Note that in this context we're discussing 'House' type objects which themselves do not generate an explosion message, meaning they do not cause any damage to other objects upon their obliteration.
Adding to the questions I have on such concerns, here's an observation. If a number of objects which require a significant number of bullet/cannon hits to destroy are placed in close proximity, upon the destruction of the one directly hammered, another such object in the line of sight and behind the just-wrecked one takes what seems to be just a single hit to destroy also. (I wonder if a third behind the second would be similarly destroyed--an experiment is in order.) I wonder if there's some oversight in the code, perhaps due to the small interval in time involved. This might well be why we can place an object inside another, even if the collision box of the outer object remains in place. Upon the instant of the outer object's destruction the inner object is also destroyed if hit, perhaps requiring much less hit energy than might be set by design.