There have been a few forums here concerning DIY 5 axis machines. Do a search and read through them. The short answer is no; when you start talking about building 5 axis routers it is not more economical to build one versus buying one. Small DIY 5 axis machines that actually work are around but they have rather limited usefulness. The majority of them are not rigid, very fast or very accurate and still cost a good chunk of change to make. Then there is the issue of cad cam. Go read those forums.