What the article does not seem to mention is that an usual electric wheelchair costs about $65,000 (and is intended to be replaced every six years or so). This and the non-availability of replacement parts is why some wheelchair users started a project to open-source a wheelchair from standard parts: https://themif.org/ Louis Rossmann interviewed the founder of the project here: https://www.youtube.com/watch?v=eaAj59…
Can you point to any project site that has released anything along this line? Blueprints, bills of material, code? There's nothing on the site you linked having any such resources. The closest thing is a block diagram including an RS-485 motor controller, which doesn't really seem like an alternative to standard parts at first glance.