It sounds like you're starting to get it figured out, and it's been a few months since I've designed any ships, but I thought I'd weigh in with a tip or two.
RedShark92 wrote:A "Battery" is collectively all of the weapons of the same type, regardless of their facing, on any given ship.
A "Bank" is one particular weapon in the battery - it may or may not share the same or similar facings with other weapons in the battery.
Each bank can be fired independently of the others in its battery, at different targets, or not at all depending on the situation and the wishes of the player.
Check, check and check.
Keep in mind, though, that per the design rules you're technically not supposed to have multiple identical weapon banks.
If you want to be able to fire into the same arc multiple times, then I believe the rules intent is to have a lot of dice, and then use the rules for splitting fire.
During playtesting, we did design ships that used multiple identical firing arcs, and it certainly didn't break anything.
For example, if you want to use a [TT][TT][TT], it works.
RedShark92 wrote:Is the starting value of the "Attack Dice" row referring to the Battery as a whole, or to each individual bank within the battery?
The battery as a whole.
Each weapon bank in that battery may then have firing arc mods to reduce the starting dice.
The firing arc mods may be the same, or may all be different.
RedShark92 wrote:If this is the case, though, how is it resolved when you fire only one of your weapons from your Battery, or if they're fired at multiple targets?
Each bank may fire at a different target, and each bank may also have its dice split up to fire at different targets.
Note that it's probably simpler to not split weapon bank fire.
My take for weapon battery/bank design is the following, and certainly take this with a grain of salt:
* Always set the BAS set at 1.
* Decide how many starting dice you'd like the battery to have.
* Decide how many banks you'd like the battery to have, and what firing arcs to assign them.
* Decide what mods to assign to those banks, which will simply be a reduction from the starting dice of the battery.
Note that you're not really supposed to duplicate banks in the same battery, but I don't believe it affects the point costing, and it certanly doesn't affect game play if you do.
EXAMPLE:
Main Beam [FF][FP2][FS2], 10 dice
This means, assuming no other mods, that the beam can fire three times, and will have 10 dice in the FF arc, and 5 dice in each of the FP and FS arcs (because of the two column shift).
Hopefully the above helps.
Kevin