who actually makes the M-tech laptops?

I have an M-tech laptop (D470K), which I love and can actually run linux on. But I find the whole process of who makes the computer quite confusing. Sales people at M-tech and Prostar (which has some sort of buisiness relationship with M-tech) are quite vague when I ask where the chasses comes from (apparently Clevo), and what exactly they are putting into it. I guess Prostar takes the Clevo chassis and adds some stuff, including a mysterious motherboard which salespeople will not tell me anyting about (it's "propriatary knowledge" ), and then M-tech then sells them.

Does anyone know anything else about these laptops? I'd love to know if the Prostar and M-tech computers are the same, and what exactly is the business relationship between the two. I'd also love to know why they are so secretive about their motherboards. Does anyone know who makes the mobos?