First time I stumble upon this, it may be something obvious. The roof top thing is a module, with a standard library object covered with a 2D fill and a circle. The rack thing is another module, put together with Cube objects. No graphic overrides (and in any case the fill is covering the object in its own module; the grill in the object shows in the screenshot only because it highlights when I select the module). I can't get the equipment module to cover the rack module in plan. Brought to front, sent to back, both as hotlinks and as elements within the modules.