Made some mods to the excellent Adafruit model.
Resized the display cutout for a 1.3" white OLED display (Amazon: HiLetgo 2pcs 1.3" IIC I2C Serial 128x64 SSH1106 SSD1306 OLED LCD Display LCD Module for Arduino AVR PIC STM32)
Removed mounting pins on monitor back cover.
Removed side cutout
Replaced rear switch with a cutout.
- Removed mounting pins from bottom cover.
Used a little ESP8266 Development Kit D1 Mini NodeMcu for the microcontroller, so didn't need the existing mounts. Hot glued the display in place.
The photos show the original Adafruit model (with the mounts which I later removed).
2018-11-14 Update: Added "pet-frame-backCover-white_RN_Simplified_WithMount_V3.stl" A version of the rear cover designed to support a Mini D1 ESP8622 board. Hole is also large enough for a USB cable.
White and Black
Super glue most parts together. Display and MCU held in place with hot glue. Did not glue the back covers, so I could get at things.