Finally I received all parts so I assembled the first prototype of my 170 mm FPV racer design (see previous posts for details and STL files).
All-up weight excluding battery and micro GPS is finally 286g.
And HOTT telemetry totally works!!! :)
* * * * * UPDATE * * * * *
First light 3D flight: https://www.youtube.com/watch?v=V6tNE8_PvQo&t=76s