Check this out: http://www.emachineshop.com/ If I understand correclty you can use their free CAD software to design your parts, send it and the company creates it in their machine shop. Now I don't know if they ship to Brazil. I guess you can find other companies like this.
Edit: I just did a quick trial and their software looks pretty easy to handle. You can preview the model in 3D in one click and the program should calculate the cost of the parts and also shipping. Their site says that international shipping is available.