As far as platoon organization, for me it's just a given that the field gun platoon is organized differently than a typical infantry platoon.
I know for infantry construction rules, it's X squads and X members per squad and that determines how many support weapons it can have before there are MP deductions etc. I respect the construction rules to establish what'll be used on tabletop.
But I don't look at a field gun platoon with 3 AC-5s, 8 men each, and think in terms of the typical squads.
Those squads become gun crews/gunners. Some portion of the platoon perhaps becomes a fire direction center/team and some portion becomes the platoon command element/team or whatever your preferred team. Think platoon CO and senior NCO.
So a platoon with 3 AC-5s. It has 3 gun crews, 8 men each, lead by an NCO who is in charge of the handling and firing of the field gun. The remaining 4 men are the platoon CO and senior NCO and maybe 2 specialists with a focus on fire direction-specific communication. And/or they are observers and calling in battle damage assessment data. Akin to forward observations.
But I've even seen some players who like to interpret the gun crew size as including some of that stuff. I know a guy who insists you just don't need that many men to fire these weapons, who would take an 8-man crew like that and conclude you technically only need about half that to work the gun and ammunition, one to command the gun, and the rest are forward observers and fire direction/communication specialist.
I apply similar logic to a field artillery platoon. Some portion of the men are actually operating the field artillery piece, another portion are fire direction center, another portion are command/control.
Whatever your individual interpretation, the point being, I just abandon the 7-man squad principal and come up with something that organizationally fits better with the field gun or artillery piece.