Hi. I'd like to discuss this with you further. Thanks for the details that you have so far, but I am intrigued. Having built several CNC machines, the guide rails, linear movement mechanisms and carriage/bearing designs are all familiar, as is the belt driven system. It seems you need someone to build it for you. I can provide CAD files for any decent machine shop to produce this. If you are looking for a one-off piece with no intent to market and distribute... I would suggest simply purchasing the unit you linked. If you are looking to make this a business venture, my skills are worth my price. Let me know if I can help at all.
-Ryan Kearney