Nice vid and pics, thank you very much.
I see now. Only thing I would still wonder is how the pigtail bearing mounts to the motor stick. It looks like yours (your style)is inside a straw type tube?
So I went and looked up vids on proven little performers like the Poonker Ministick and similar planes and none keep the low ceiling yours does nor did they keep a tight enough turn to actually fly in a "living room" as they state. So far the only one that has done both has been your little guy. I did find one called the "Living Room Stick" that used 3mm rubber and it couldn't stay off the ceiling. They mentione that they wished they had 2.5mm rubber and it might not have been as hard a climber.
The "Portable indoor plane" seems to eb the obvious ticket.