That looks like it worked out really well for you. We use those boxes too to store our skid loaders with salt or mulch depending. With a set of string lights inside makes for a secure storage unit.
Shipping container has worked out great for me storing all of my implements. I made dollys for my implements, out of furniture dollys and 2x6s. I also made a platform to sit on my boxblade to be able to stack the york rake to save room. I use my pallet forks to stack and move implements to and from my container. I set them in the container and can move them by hand to shuffle around what I want. Works really well.
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