I'm planning to house-rule my b-wings to (in my opinion) better suite their primary role as a heavy bomber and getting a better role-distinction between b-wing and x-wing. Looking at the stats in wookieepedia i found the primary weapon for the unmodified b-wing is 3 Ion-cannons.
Here my pretty raw idea: Title-card for b-wing (-x)
B-wing A/SF-01
Use the ion-cannon as primary weapon.
This card would change the ion-cannon from a secondary to a primary weapon (including the correspondent rulings), changing this b-wing variant from a "knife-fighter" to "cannon-focused", perhaps also ordonance-focused support craft.
Here my questions:
1. How many points could I substract from the point cost of the basic b-wing?
2. Would it be better (similar to the new targeting-computer for the Tie-Advanced) to enable point reduction for cannon-upgrades?
Thanks in advance for your ideas and comments! And I hope, I didn't bring up something that has already been discussed a long time ago...