I made this modell for the Joy-IT RB-LCD-7-3, which I use with a Rasberry Pi (Link below) 
The cut out for the Display is 100 x 165 mm
Total size: 130 x 175 x 4 mm
The 4 screw holes are for M3 with nuts and fits the PCB holes

I printed it on a Prusa Mini+, PLA, 0,4 nozzle

https://joy-it.net/en/products/RB-LCD-7-3