All this boxes, craftsman, snap on, matco, blue point... I think they are overpriced just because of the name, and so called liftyme warranty... which is hard to imagine when will you wear the box like that. Anyhow, I would rather build my own, and save the rest of $2500, even though it might not look as good. What is so hard in attaching few sheet metals, put some rollers underneath... make your own drawers...
Where I work the cheaper boxes fall apart. The Snap On boxes last a lifetime.