Single tier frame?

Found this item on Craig's List for $100. I was thinking it could make up the bulk of a single tier stand. The rollers appear to be removable and with some supplementary steel and a little welding, I think it'd work. Thoughts?

http://chicago.craigslist.org/sox/bfs/2794718389.html

I think the main cost for this item is the rollers, removing those and all that's left is basically a stamped steel/sheet metal frame (500lb capacity is a giveaway as to what it's made of, as are the adjustable legs and roller attachment points). It'd be cheaper and stronger if you made it with tube or angle. Sheet metal is strong as long as it keeps the shape it was designed/made with. Once you dent it... well you will have many gallons of hot stuff on there.

Back in my college days i had a roommate that bought something like this. Each shelf could hold 300+ lbs. Until we climbed it like a ladder, denting the sheet, then each shelf could hold 30lbs.
http://www.walmart.com/ip/Edsal-Home-E-Quip-Gray-Steel-Canning-Shelving/17444292

Thanks for the info. I figured that it might not be durable enough, else I probably would have seen a similar setup on these forums...