SFPV please advise I already have the motors and frame for this Räsvelg 3" build you dumped the $100 SIRIN FC with onboard VTX for what MRM FC and
then what did you do for VTX please ?

Looks good. How flexible is that 3D printed part? Curious if hitting a gate would just push the cam back into the FC.
You may want an o-ring on top of the FC between the FC and the nylon nut. Technically you'll still get vibes through the bolt/nut to FC. Not really isolated as it is.