I could also shoot a sound video, but since I use my Photo cam to make it, at maximum volume it would resound just like garbage. However I have found that the Rx-14 sound was clearer, with more dynamics and especially the MG and cannon were more distinct from the motor. Also, the sound now that the hull is closed, is quite lower that during testing. I will see how loud it is in an open courtyard, maybe this weekend.
Since I have begun to paint the whole thing, I am not bringing it out till... maybe sunday.

Some more considerations about the flashes and switches: I could barely fit the 5mm flash led you sent me inside the barrel, since it is good for a 3mm led, while a 5mm one is too big. I had to rework the inside of the barrel, as well as the led itself to fit it till about half way through the barrel. Enough to see it, but closer to the muzzle it would have looked even brighter.

I also thought about fitting both leds inside the barrel, but there is not room enough even for 2x3mm leds.

Finally, I thought about using a double pole micro to duplicate the 'K' button, and act at the same time directly on the left stick contacts, to operate the recoil and everything else using just a button.
But as I wrote before, that would not have worked, since if the 'K' functions do start at the same time as the barrel recoil, the recoil itself is cancelled. The barrel recoil has to start slightly before the 'K' functions, in order to alllow the barrel return micro to do its work.