Interesting, I find anything nose or cowl mounted to be easy mode compared to wing mounted.. and even wing mounted seems simple. I feel like the AH2 gunnery should be harder, but that's just my opinion. 
They both work, I just think the crossover makes it a bit easier to ping the other guy outside convergence.
As to gunnery, I think it's about the best model I've seen in here. Individual bullet modeling, trajectory, dispersion, pulling G's changes hit location...
WARNING! NOT FULLY RESEARCHED GENERAL LOGICAL STATEMENT NOT BASED ON PERSONAL EXPERIENCE WITH HEAVY WEAPONRY MOUNTED ON COMBAT AIRCRAFT FOLLOWS!Sorry, gotta qualify things properly on this board... I don't know that much about how things react coming off planes IRL, but I do know a fair bit about guns and bullets.
I've heard somewhere along the way from guys that generally were not full of BS that firing when your plane's not moving directly forward, like if you kicked full rudder, causes dispersion to go WAY up, like to the point of essentially useless accuracy. That doesn't appear to be modeled in the game. Perhaps it's been overstated, I don't know, but I could see a 400mph head/crosswind from the angle you get from full rudder deflection playing havoc with a bullet as it leaves the muzzle of the gun.
Maybe it's been researched and dismissed, I don't know. Other than that though, I think gunnery in the game is quite well modeled.
Wiley.