Cost of aluminium checkerplate toolbox

Hi everyone

On the side of our Trak Shak at the moment we have an aluminium checkerplate toolbox that is the size of three 20L jerry cans and sits where the jerry cans usually are.

This leaves room for 6 more jerry cans (water and/or fuel), which is more than enough for us on most of our trips, but on the longer, remoter trips it would be nice to have the option to carry another jerry can or two.

So I got thinking and thought one option (apart from not using the toolbox) would be to have another toolbox made up (I haven't seen any off the shelf unfortunately) that is the size of two jerry cans (or perhaps even one jerry can), and then it will fit beside the jerry can/s on the trailer.

Would anyone have a (very rough) estimate of what I might be looking at to have something like this made up?

I'm guessing it would most likely be a bit pricey (particularly when you see the cost of off the shelf toolboxes) and therefore probably not feasible. But with 7 of us in the Trak Shak, every little bit of space we can get for storage is worth considering.

cheers
Ian