i bought one of these machines, it was delivered the other day. If you wan't to fanny about with .2mm sheet steel your laughing, anything over that your going to have to think about strengthening it!
I welded it to an old cast iron base, put a piece of 1.mm sheet through and all i got was deflection of the dies, and a **** e bead! pure crap!
I've got a similar machine and for what I use it for I'm happy.The best modification I made to it was to take the operating lever of it and replace with a car steering wheel, this makes for a lot smoother action than pumping the lever up and down.
I haven't used it much but find trying to keep a straight line more of a problem than any flexing of the support.Need to make some sort of guide for it next.