This ^^^
Yes you can save some money doing it yourself. But taking into account the amount of time to obtain the case, blast it, clean it paint it, assemble it, etc...you're hours into into. For me, my time is worth enough based on what I make hourly...that things like this become more desired. I'd rather spend the extra $ for a complete ready to run case then spent what will amount to less than say $10/hour saving by obtaining everything (fuel, driving time, etc), pulling it apart, assembling it, etc.
Yes for most of us it would make sense to buy the used $250 case with SYE. Then again, some want to know they're essentially getting a new case for $500 more that is going to be a bit better than a used one.
Me...spend a liiiittle more and get a used 4.3 Atlas