http://www.instructables.com/id/How-to-Make-Your-own-Plasma-Cutter/
just a thought..
ive spent over a decade selling welding equipment etc, and I would say that if you are not doing all day everyday and the good reviews outweigh the bad in content as well as quantity .. then you are probably on to a good thing
the real let down is the quality of internal parts. most nowdays use the same components and probably sourced ex China...
given that there is a lot of welding equipment made in china, ( my own inverter welders (x2) are seen on Aliexpress in different colors being offered for sale with your brand painted on ) im very happy with their performance so far.. in fact a engineer I know has round eight of the same machines as my two used in a workshop capacity all day long
see if you can test before you buy, ask the seller who else they sold one to. if its a business, take time to ask them what they think .. if they have a minute ive people are happy to chat about what they do ..
just a thought
over and out
ps if its any good you could tell the rest of us what you think