mArlo, my mid-size Arlo robot platform, is complete and running as of today - Memorial Day, May28, 2018. mArlo uses the components of the Parallax Arlo Complete Robot System in more compact configuration - just under 12" in diameter. Many of my parts are from previous versions of the current Arlo.
Below are build photos of the final assembly and a quickly shot video of the mArlo running some BlocklyProp Code written for the Arlo using Ping))) ultrasonic detectors for obstacle avoidance. It is called Arlo Roaming with Ping))) Obstacle Detection. The code is at this link - http://blockly.parallax.com/blockly/editor/blocklyc.jsp?project=15424
Notice the addition of an additional breadboard area in the final photo.