I've had to go back to redesign some parts with my quieter SR2 case, the assembly was just a bit too complex so I'm simplifying. Until then, here's some screen lids for your current SR6. The SR6 beta will likely change this part.
Add your nuts of choice (M3 hex nut, or M3 square nut 5.5mm x 5.5mm x 2mm or similar tolerance) and your standard 0.96 inch 128x64 OLED. There's a little slot for plugging in your jumpers. Attach screen with 4x M2x6mm directly into the plastic.
I think square nuts are better in applications like this, and if you are using a fan with your SR6 I recommend using the lid without holes, it forces more air around the servos. (Thanks to SSDD for confirming this with a previous part)
BOM:
20x M3 Hex or Square nuts
4x M2x6mm
1x 0.96 inch 128x64 OLED obviously ;)
Current SR6 fastners