From Suspicioso : "This one has been debated back and forth quite a bit, but for me there has always been a "model like" quality to the Chad/Raj drones. (I'll set the BB one aside for now). Anyway, I'm no expert, so I decided to ask a SF special effects expert for their opinion.
Sadly I can't name this expert, though I think its extremely likely you'd be familiar with his work on many famous SF films and TV series. Anyway, at my request he very kindly took a look at the Drone images; as a professional special effects model-maker he's quite used to repurposing all kinds of odd materials to create alien spacecraft.
His verdict is very definite that this is a model:"
Well I've now had a chance to look at the photos in detail. [And I] think it's a model made fairly simply from a round 35mm film carousel (those things used to show slides) as the central circular section, and another lampshade with some bits of steel or aluminium rods as the curved pieces going up from the carousel. With the addition of some wing-like pieces with rods running through them added just to make it look weird.
I have a couple of these carousels & held at the angle of some of the photos they are EXACTLY the same as the lower section. Even the detail of the carousel is the same with several layers of circular section raised up and the number of notches running around the rim where the projector's "arm" turns the carousel.
Apart from that it simply looks small & model-like, & could have easily been held in the air supported on one of its "wing-arms", or just hung up in front of a full-size background.