Iluveggers
Enabler
I would definitely put up a new roost bar, at least temporarily, as your original flock might be possessive of “their” space. A section of the run separated with cheap chicken wire & zip ties to help with see-but-no-touch for when they all have to be in the run together. Definitely add a few more feeders & waterers so the new crew doesn’t get starved out once they are fully together. Good luck!