From what I experienced of ODM in China, I'd guess that Pegatron not only provides the starting point but also do all the designs of the specific motherboard, the plastic outfit, pretty much all the hardware. The guess is reasonable because from what FG claims, they put much resources on the OS development, thus, for a small startup, it is impossible for them to develop the motherboard and the whole industry design (even they have the ability to hand build a prototype).