I don't have that mill either! I would have to send the PCB out for manufacture but if I wanted the controller bad enough, that's what I would do. That assumes I have the skill to duplicate the design. I do, some don't.
I always like projects that offered the PCB or a complete kit of parts for sale. Then it's just a matter of soldering it up and doing the code weenie work. Nuts and Volts projects tend to offer up a kit of parts. Maybe not all of them, but many.
I'm not sure what the think of the schematic. It is abundantly clear where there are connections and where there aren't. I just haven't seen the 'dot' connection style used along with the jumper style. It's pretty clear how things are connected but I wonder if I would find it distracting after spending time with it.
I suppose there is always a problem targeting a design at a skill level. Sparkfun tends to provide helpful side information for their projects:
https://learn.sparkfun.com/tutorials/noisy-cricket-stereo-amplifier---15w-hookup-guideLike anything else, if a person wants to build the project, they will have to get up to speed. One way or another, they need to develop the skills. Building stuff is one way to do it. Some projects fail, others succeed. Education has never been free.
I didn't read the article! I looked at the pictures and figured it was achievable, for me. If there are errors in the text, I wouldn't have found them. But it has always been this way. When I was reading Popular Electronics back in the '50s, my dad would always have me wait until the errors were corrected the following month before getting started on anything. I think it is still that way! Wait until the errata is published. Or be prepared for disappointment. But we learn from that as well!