I know this is an old thread, but I found the idea of a Hover Creeper online. It appears that Matco Tools was supposed to be marketing this item, but as you know, it is in not in their catalog. Of course, this is an idea that was going to be produced some 12-13 years ago.
I did find that it was originally conceived by a man named Kirk Whiteside, who is affiliated with Whiteside manufacturing and they market a bunch of industrial creepers. I have send emails to both Matco and directly to Kirk at Whiteside manufacturing to find out what happened to this unique product.
It is more of a curiosity at this point. I would like to understand why they went so far as to design, develop and market the product, but failed to sell it. Maybe there are some inherent design failures that kept the product from launching - don't know.
I will report back if I find out anything conclusive....