Keep the mature birds and the younger birds as far away as possible... You dont know what the mature birds may be carrying as far as diseases go.... (the adults birds may be able to fight it off but the youngers might not...) Other than that it seems that this is a good idea... Oh yeah, I highly suggest only getting one rooster...... having 2 roosters for 2 hens Will cause them to fight ALOT... they may even fight to the death...