Lynne,vickie, would love to see how you have that set up..might be helpful idea for a lot of people.
My creep is just a 6 x 6 corner fenced off under the covered run really. I put a sliding small door opening in the gate I use. The trick is to have the little door slide SIDEWAYS, not up and down. The older birds know how to skootch UNDER something it seems, but have not figrured out how to get their fat bodies through a narrow vertical opening. The babies figure it out in a hurry if they spend a couple of days in there.