Agnaldo my Brother,
Get thee to ebay and search every day for a rigid frame (or a rigid frame kit if the front of your bikes stock frame is undamaged).
As long as the engine still runs, you need only to disassemble carefully, placing all bolts and pieces of each assembly into small plastic containers, boxes or coffee cans labelled carefully. If you have digital camera, take lots of pictures of how it looks before and during take apart.
Search for a good manual on-line or buy a good hardcopy manual. Buy an impact driver and a six pack of WD-40 (penetrating oil). These are your best allies for taking apart the old "Rice Burner" Cold cervesa also helps very much :)
It also helps to have a friend who can weld. As for painting, Dupli-Color aerosols are very good if you can get them down there in S.A.
