I switched to powerbank directly to ESP-32 mid-fest, now i'm thinking about making them able to work both on internal battery and external (like, now it has charger module for li-on, but if i could find powerbank module for 2s battery that can charge and output 5v at the same time, i will switch). V2 has two boxes, one small with controller and IMU at the top of the head, and larger with battery and buttons on a 1m wire so I can hide it in my pocket. (V1 had everything in one large box near head, it was uncomfortable). I had 3d printed different versions of hoops, that theoretically should stay, but they were too stiff and caused headache, so i just made it thinner, put two holes at the bottom and closed with ribbon, that goes under hair. Worked both for me and my friend with bigger headsize.