There will be changes to turrets with Z&B? I thought any new rules from that source were for Zeps and Bombers only? (But perhaps Patrick has given you a more detailed preview already...)
Apart from that, I know we're treading difficult ground here, as the construction rules for a 2nd turret or a 360° turret are not explicitly stated anywhere. But let me try to summarize the turret rules (with some speculation involved):
1) Rear turret weighs 400 lbs. Can mount two guns, #7&8. These guns weigh 50% more.
2) Front turret weighs 400 lbs. Can mount two guns, #1&2. These guns weigh 50% more.
3) 360° turret weighs 720 lbs. Can mount two guns, #1&2. These guns weigh 50% more.
regarding 1) Construction rules stated in Aircraft of North America. Limitation to #7&8 learned from record sheet.
regarding 2) Basically the same as 1). Has been officially errataed that only rear turrets are allowed. Has been revised later with the introduction of the Mako. Mako lists guns #1&2 for the front turret.
regarding 3) Deducted from the Monitor. Lists guns #1&2 for the 360° turret. Construction rules applied as far as possible; rest of stats calculated/extrapolated.
So, by this there are several possibilities as what types and combinations of turrets might be possible to mount on a heavy fighter:
A) only one turret allowed
B) two turrets allowed (Balmoral)
C) three turrets allowed (one of each type, no plane of such type ATM)
regarding A) this would actually suffice for all canon planes...
regarding B) different combinations possible: front+rear / front+360° / rear+360°.
regarding C) which weapons would be valid for the 360°, if 1&2+3&4 are blocked by front and rear turrets?
Granted, turret guns are always #1&2 or #7&8, but other then the record sheet, do we have any evidence that the remaining gun slots may not be used? Especially in regard to the 360° turret.
Sorry, if I seem trying to make things more complicated than they probably are or should be
That's not my intention, just trying to avoid missing something...
Anyway, what options do you plan to use MadMaxx? Two turrets, with one of them possibly being a 360°?