I bought JD's Garage's plans to build a CNC plasma cutting table. Their plans are very thorough and include an excellent parts list. I use their 1:1 printable templates to cut out parts. I purchased their 3D printed parts they offer on their website. I made a few mistakes along the way, but this is a doable project that will save you money over buying a table.
I use a free version of Autodesk to draw parts. I use OpenBuilds free software for G-Code to control the CNC. I am using my YesWelder 65-DS plasma cutter.