Found a pretty solid video showcasing this. Not a techncial deep dive or anything, just someone giving it a go. The sounds are really nice in this video and in the dev’s own boosted audio cockpit video they just uploaded (thanks for that Dano!)
Edit: For anyone not familiar, this is the same dev (or at least one of the devs) behind the freeware Cabri G2 and Mosquito X/EL helis on .to - As I recall those were very nice for freeware, especially the Cabri which has some pretty stunning visuals.
I think I’ll take the plunge by this weekend and give this one a try. My only hesitation at this point is how this thing is doing aileron rolls in every promo video. I’m still curious what data the roll rate is based on. I’m still not sure if Howard Hughes ever even rolled his (certainly does not mean it couldn’t roll at that rate, it does look fairly maneuverable after all). I’ll do more digging for my own curiosity’s sake. Not saying the dev is wrong here, I just don’t know what it’s based on (other than I’m sure the pure fun of rolling it whether or not Howard ever risked doing it himself 
)