This is horribly crude, but here goes. Dimensions are in inches, and approximate. Cut one out of cardboard and fiddle with it to get it the way you like. The 4 1/2 depth might be more than necessary. With the top edge of the phone pushed as far up under the controller as it goes, if you stick the 3/4 x 2 1/2 tab into the space between the phone and the controller, you can push the hood toward the screen until the angled edges on the side fit between the arms and contact the screen. There should be enough interference with the lower edge of the controller to hold it in place. The angle keeps your face from reflecting in the screen and gives more space around the sticks, but also makes it harder to reach the screen with your finger. I use a stylus.
I'm not good at building things by hand. That's why God made machine tools.
View attachment 28338 View attachment 28342