I could do this. When I googled "manufacturing engineer" I saw pictures of robots building cars and big automation stuff. But this is a small project and its doable. Im sure I would have problems with the mechanichal parts, but since its already designed it should not be difficult to put together, and getting the electronic and programming parts working is my thing. No problem there, I could even do it wireless so there are no cables going around.

What I dont understand is the business model. So you dont want to produce and sell this things, you want to lease them? It might work for a while but you are just screaming for competition if the thing has success. Its not that hard to build for a company that has a couple of half-competent engineers.

But lets assume that business model. What I dont understand is this: Why do you need a box to have authentification in itself? Why not charge a monthly fee to the business that its using them. The business would pay a fee to have the machine for a month, it would connect the machine to the computer (USB, serial, wireless, ...) and a computer program would connect the webpage server to the machine so the customer could control the machine from his (or her) web browser. The programs would be included with the lease of the machine.