Glad to see this option for disabled people with funds to do this. I can see you put a lot of thought into it! If I may make a suggestion for the videos - have various disabled folks riding it talking through the features. Folks who don't have certain physical disabilities can compensate and balance in ways folks with a number of different disabilities cannot. So someone who's not disabled saying a given feature is "easy to use" is not the same as seeing a disabled person disengaging that handlebar, then transferring out of their wheelchair and into the quad and seeing that for a given disability, a feature seems fairly accessible.
You made a great machine for those who need it, as always. Now just a tip: you forgot to show the eQuad night capabilities (is not enough to say it has great lightning power, making a night scene enhance the video looks a lot).