Kennedy tool boxes will last several lifetimes. Used them in a mechanics job a long time ago. Used the drawers as a ladder to get up in high to reach spots (These were the big, big boy tool chests). Really top level quality.

My wife was throwing out a hard case small luggage piece. I grabbed it with the idea of making a portable, rolling tool kit from it. Still thinking about it, but realizing that I don't travel much with a large volume of tools, however for the OP it could work out really well if care were taken in the design.