Computer cabinet for shop floor

Do to limited space I am going have to keep my computer, monitor and printed out on the shop floor. We do A LOT of cast iron work. I am looking for a cabinet that will need to be robust enough to to be on the shop floor and able to keep that cast dust out. Does any one have any suggestions or a reasonably priced unit that would fit the bill? I would like to be able to lock it as well, but that is not a deal beaker.

Thanks for your help / suggestions