I haven't been here in some time. I hope everyone is doing well.
I've been building multi-rotors (and Planks) this year, mainly because a "drone" shop is the last privately owned hobby shop left in my immediate area after Covid killed off the other two. My latest is a Frankenstein monster of a front-steering tri-copter made from parts of several different carbon fiber airframes spliced together into one unique creation. It flies very well.
Your challenge, if you accept: Try to guess what parts came from what different air frames.
I know at least a few of you will see something familiar!