That looks like a usable sized box and it looks good, but it too is not waterproof so some drain holes in the bottom might be in order. I put one about that size (18 L x 8W x10D)on my LS (it didn't have anything) but I bought the plastic waterproof tool box at my local farm and ranch for $15. It is large enough to hold a 15" adjustable wrench, hammer and other tools. I took off the steps from the right side since I don't use them anyway and fabricated a bracket to hold the tool box. After assessing the tractor for locations, this was the only place that was suitable for accessibility and high enough of the ground to prevent damage to the box. I built the bracket so the top of the box is just below the cab door. I couldn't put it behind the cab like yours as there it would interfere with top link and prevent sight from seat to the rear of the tractor implements