Hello Sir,
First of all thank you for your competition. My proposal renderings attached to my submission.
I read your description and I used as you mentioned parapet style and material choice. I think you can cover light gray panels and labels of brand have to be focus. Holistic composition approach is important on the facade design. Area of the labels can be darker surface. Brands can put their iconic logo and customers can recognize them. If you any question or revision. I can make it. Hope you like my proposal. Thank you. Have a good day! :)