I designed this mobile Heltec V4 Case with a backup 80 * 45 solar panel. It fits a stadard 3000mAh battery (10*65*35). The solar panel is not the main powersource of this built, just for backup purposes. 

You can attatch a beltclip of a shure UR1 transmitter. (I bet other ones fit also, but I cant guarantee that)

Please thread the Antenna mount through the mounting board and cover bevore screwing on the backpanel. You'll need 4 pointy M3 screws not much longer than 15mm.