How far have you gotten? Do you have the base item set up yet, so that you can at least purchase it, and you'd like help scripting the +1DV/-1AP?
Or are you further back in the process? If so, what have you figured out?
Personally, I'd just use the Custom Cost option - just let the user talk to their GM, get a declaration of the area of the weapon, and then use that to calculate the price themselves, and enter whatever they've calculated.
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