Looks like a really useful tool cart for the right size shop and manufacturing process. Unfortunately you get a lot of opinions here that come from those who only see from a narrow band of view like their personal shop experience. Fortunately, the nice thing is you get a lot of opinions here from individuals with varied experiences. Sometimes they are the same people and lots of opinions are usually good to be able to pick out what applies.
After seeing you video I can totally see how it helps in your work environment and would as well in many similar sized shops doing similar fab work.
In my little 2 car garage it would never fit but, hey maybe you can offer some variation in sizes and shapes to fit different shops and price ranges.
All in all I love that you filled a need with creativity and did it all American and, then put it out there to see what part of the population could also benefit while expanding your local business. Hmmmm……that's kinda what we used to do a lot of here in the USA.