The screen goes behind this, facing the other way, with lips around the edge to hold it in place. The screen controlling board will be in that big gap in the middle.

I took an overhead photo of the controller to get the curved contour shape of its top, then scaled it and traced over it in Solidworks. The bottom of this screen holder will go inside the controller and be secured with screws & glue.

There is also a back plate which goes on top of this and has grills for ventilation.