For $600, That is great! That is one of the main reason I build my own stuff, that and I just like to build I can usually beat what I would pay for a commercial product, including the cost of a new tool. That is how I have put all the tools in my shop over the years.
Ron, I agree with you. The $600 does not include the $1000 for the new Miller 175 mig, cart, 80cf bottle and accessories. I just like building things, its kind of like therapy. LOL