This an accurate model of a 7" Rpi screen I got from Aliexpress.

If you're using the newer or older versions of SketchUp, I posted my model on the 3D Warehouse so you can download the version you need.

3D Warehouse Model Link: https://3dwarehouse.sketchup.com/model/4f963701-71dc-47d6-bc65-2971643e47c6/7-Screen-for-Rpi

(7inch Screen Model 2.stl has the actual screen pushed in by 1mm, so you can tell the difference between the actual screen and the border)