Thanks for your comment. It is indeed a lot of fun! I am planning on making a Youtube video and blog post about this project and I can make an instruction about these implements and the software. I'll keep you informed. About the frame: It probably is too light for serious milling (like milling hard wood or metals). However, I am convinced that it is suited for light operations such as milling and drilling PCB's and engraving PMMA or aluminium. I must be mentioned that I have my z-axis upgraded to make the gantry much stiffer and more accurate. I took this for granted so I forgot to mention it. I have designed a Z-axis upgrade based on an existing one and I will place this upgrade on Thingiverse soon.