Mini Split question.

Im building a living quarters out of an old barn on my property. A barndominium as bad as i hate saying that but it is what it is. Through work i have access to pretty good pricing on some mini split units and because the ceilings are going to be tongue and groove vaults with no drop ceiling its the most feasible way to cool and heat the place. The barn will have 2 bedrooms, each with their own bath and shower. A large liiving room/Kitchen area and a small mud room with laundry and will have a really small half bath in it. I found a 55k mini split that i could have a wall hang unit in the main living room/kitchen area and then i could have 4 cassettes, could i just put one cassette in each of the 2 bedrooms and mud room or do the bathrooms need them individually also even though they are attached to those rooms and probably oversized for the square footage.