I designed an Old TV like Raspberry Pi 3 enclosure for the Raspberry and a 5 inch Display. I intended to use it for the volumio, but it turned out to be a great all purpose "Vintage-TV". The Display I used can be found here:
Everything is pretty straight forward, just print it and assemble everything. I used Carpenters Tape (double sided) to hold the screen in place but I am sure there are other methods to do that. If you are interested in the step files just write and I'll send them over so you can customize them!
As mentioned earlier I used some double sided carpenters tape to hold the screen in place. Another thing I ran into was the balancing due to the weight of the screen and the raspberry pi being far in front of the part. I angled the feet a little that should solve the issue. But if you intend to place a power bank into the back of the case it should be balanced even better.