So, for builder base wars to be added there must be something unique to them. here’s my idea.
I think in this war you must have a equal amount of players (14,16, etc.) and there will be pairs of 2 most similar in war weight, they will get a larger grid and make a combined base with all there items on there current base, like sharing a editor.
On war day they can both attack at once or both attack separately, and if they attack separately it will be like boom beach where there damage stays. This is just a idea and i understand it would be very hard to code.