Sounds like a good plan, one I hadn't thought of.. My chicks go from the incubator to an in house brooder for 3 days then out to the porch brooder for 2 weeks.. Then the grow out pen which is in the same area the chickens free range then from there to the finishing pen which is next to the main coop... I hadn't thought of doing it any other way but like the way you describe the bio security..
I have 3 Grandsons, the youngest being only one but of the other 2 Elijah (the four year old) is the most into our little farm here, He once told me that when he grows up and has his farm Me and his Poppy have to live with him so I can take care of his chickens... I told my Husband, our future is secure
On another note.. been out working the property all day in anticipation of a large BBQ were hosting tomorrow for our Daughters 24th Birthday.. When I came in a bit ago I discovered that in my absence we have had a Turkey explosion... 7 out, one zipping two more piped... If they all hatch this will be my best hatch rate to date...95%