Well, this isn't gonna help you.
Because we have a family bed (300x220 cm.) where we co-sleep with two 6 yos., 4 yo. and baby. (Emergency care baby, will be gone long before this Bean comes along who will take that place.)
We have plenty of bedrooms though, when we got the house it was a 6 bedroom one. One of those is a library, and it will never stop being library. One is a sensory room, we don't want to give it up, but if we must, we will, and make it a corner of another room again like before.
11 yo. has his own room. We have our room with the family bed. And the other two are currently a guest room and a play room.
The 4 yo. will want to move out, perhaps in not too long, so the guest room will be turned into his bedroom, and the play room will double as guest room.
The 6 yos. can't move out. Well, the girl can't, she has severe special needs, and needs to sleep right next to one of us, her situation can be critical in seconds. And her brother is not gonna move out on his own. Those two never sleep without each other.
Even when we have night nurses, the two of them and one of us usually sleeps in the guest room to give the rest good sleep.
If we, in some years, decide to go with night nurses the whole time, the two of them will get the last bedroom, and we'll put guests in the library/sensory room.
Oh, and this Bean, well, I expect Bean will be with us for years to come. And whenever Bean decides to move out of the family bed we'll put Bean with one of the others I think, instead of loosing the sensory room. Probably with the now 4 yo. But by that time, our 11 yo. might be soon moving out so.