Download our 3D CAD model of the DJI Tello for free. The files include the body and a separate part to close up the bottom of the quad. We successfully turned this into a real flying drone in less than an hour. The design excepts 8.5 mm diameter by 20 mm tall motors just like the real Tello. We used these motors and props for the build.
There is a platform inside the body that you can attach a board to using double-sided tape. The platform is flat and parallel to the ground so that the drone’s sensors are oriented correctly.
We took apart our Eachine QX95S, which also uses 8520 motors, and stuffed the board in our Tello model. The board will accept a single cell (1S) LiPo battery, like the one you might get with a Hubsan H107.