Jen, I haven't made one but gave building a Drifta style kitchen some serious consideration.
After pricing all the bits (not just the obvious ones, but all of the bits), I reckoned it just wasn't worth the effort to try to make it myself. I ended up buying the Drifta DPOR kitchen and tucker box and couldn't be happier. Top workmanship. And after owning one for a year, each time I pull it out, I still marvel at the thought and innovation that has gone into such a seemingly simple product. There was no way I could have made something like that.
Now having said all that, a simple storage box may well be a different consideration and something you could consider making yourself.
For what it is worth, I will getting my DMax rear drawers made by Drifta as I reckon they have such a top product.
Good luck
KB