Certainly Luciano for a device of the complexity and sophistication of the ZyXEL product, but for something a lot slower and far more basic (although functionally it'll still do the job of conveying Ethernet over Power Lines), you can do it for around US$250 and about two weeks worth of effort (assuming you know what you're doing!).

If it's for yourself, it's just not worth doing. Far easier to grab your Credit Card (or if you don't have one borrow a friends) and order one ready made - it doesn't matter where you are in the world - nowadays the world is a small place, you can buy just about anything from anywhere.

If it's for a commercial project, then asking how to make one on this forum indicates you don't know what you're doing... so either you want the schematics and code handed to you for free, or you're looking at closer to two years rather than two weeks...

Either way, enjoy the experience...

> i dont't know why melani stop me again and again

I wasn't aware I'd ever stopped you doing anything. Please explain yourself...