I envey you.
Your Girls are 3 weeks younger then mine? Is that right?
I just double checked, yup 3 weeks younger on both counts, younger and older.
Ive been thinking about a couple newish ideas.
I might try to make a ladder that goes from the tractor into the lower egg door, that way the younger chicks could go in to the coop at night, the only problem would be, how to get them back into the tractor the next day.
The other idea is one i've been kicking around a while: to build a small fence that goes around the coop and tractor and create a nuetral zone.
Figureing out how to do it is the problem there.