One thing I'm kinda missing are single-barrel turrets. The vast majority of turrets on our ships are double-barreled so it'd be nice to have more of the single-barreled type, especially when the double-barreled guns would likely often end up not firing paired shots anyway. For example, all the ISD's multi-barreled guns (and that's all of them, except for two single-barreled guns) fire bursts rather than salvos, because it's more movie-accurate, making the number of barrels on each gun fairly inconsequential.
I think double-barreled turrets are perfect for the most common type (a medium-range "standard" laser), whereas single-barreled guns would IMO visually work better for long-range lasers with more punch and slower rate of fire.
Also, while I think Home One wouldn't sport much anti-starfighter guns, if you want to add some (around the command pods, for example) then the possibility of gun ports has remained completely unused on our ships so far. That is, simply an opening in the hull, bordered by hangar-entrance-style lights and a black forcefield (rather than a transparent one), with a singlepart turret behind it.