My build (now with secondary shoulder buttons!)

[Fordi]

Initial build: https://imgur.com/a/Cj3hG

Later post with L2/R2 shoulder buttons: https://imgur.com/a/oK4VJ

Shoulder button Thing: https://www.thingiverse.com/thing:2789672

The thing has been updated to include a deeper shield for the outside (the version pictured lets you see into the case).