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After some years following different DIY sites and forums, I decided that it was time to jump in. I choose to start with a premade platform to ease first steps (which was wrong, but I discovered it later ;) ) The 4WD DFRobot platform is well made, instructions are available and quite complete: Step after step, the work started well: Add the wheels, put a controller board: I decided to post on LMR at this stage but in fact I worked further since the last picture. I'll complete with my Sharp ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/gary-the-4wd-experiment