Hey Esden,
thanks for helping me.
I managed to to compile (with the EXPO correction) and upload (using sudo, otherwise I didn't get the permission).
So, I switched everything on and lots of lights appeared

.
Is there any light that says:"Ok, I see Rx and I understand it."?
I haven't got time to browse through Mocha user manual if there is any info about that.
Cheers,
David
p.s. Great job on quadshot. It got me just two afternoons to assemble it.