A playlist with all videos in this project can be found here DIY CNC Plasma Machine
The total cost to build the MPCNC was about $400. That includes the license fee paid for ESTLCam. I already had a few items on hand so the total cost may be a little more if you have to purchase all the parts. The MPCNC web page is full of info and examples. The forum also responds to questions very quickly. That web site can be found here. Since there is so much information available at that site, there won't be any specific information here on the assembly or debug process.
This is a list of all the parts used and where to get them. There are also links to the add-ons you can 3D print below.