Necessity is the mother of invention, or so I've been told! You'll get this figured out. Some photos of what you have planned or what your current set-up is now would help folks visualize what you are saying a little better.
We draped green plastic fencing from the top of the run partway down the brooder pen, sort of like a short, ventilated shower curtain. It's attached at the top of the cattle panels with zip ties. The side I need to access, the people door into the brooder pen, is held in place with a bungee cord stretched between the front of the run and the side of the brooder, which kinda holds it down. All I have to do to get in is release one side of the bungee. I have photos of that if you think it would help, but it sounds more like you are still in the planning stages of the entire setup, rather than working with an existing setup. I didn't want to put boards over the top because I'm old, a little bit disabled, and crouching to work in there with the chicks would be too hard for me to do.