This is exactly what prison inmates in general population who want to build their lives and become productive in life should be doing. Which is working, but working in a field with the skills needed so they not only have good jobs in prison, but also now have the right job skills and job experience needed to get themselves a good job once they leave prison. And not need to come back to prison because now they have the skills they need to do well in life legally. This is a much taxpayer investment than to lockup inmates all day except for their meals and yard time and perhaps doing a few chores, that is for inmates who are in general population. Where all they learn there is how to become better criminals.