We based this design from ones that we saw on youtube. Mainly the askJeffWilliams and DanHurd channels, but a few others too. I didn't have the tools for making it, but my buddy did and he was more than happy to get to use them. As soon as I asked him about this project he was all excited to get out his welder and all that stuff. I was hoping it was gonna be a little cheaper, but it wasn't to bad. Around $700 in parts and another $200 to my buddy for his labor... I had wanted to keep it in the $500-$600 range, but things just keep adding up... at least we kept in under a grand. Considering that buying a similar sized impact mill from a company online will usually run $3,000+ I don't think we did to bad.