Doug,
This would make a most excellent clothes hamper. If lidded it would be a great animal crate as well (thinking more like chickens, birds but other too). I can see the thing being filled with grapes, and sadly with potatoes. So many possibilities. Remind us what you are going to use it for.
Question: You pinned the corners, I see that holding the top rail joint, however the pins look to be perpendicular, as in squared (90 degrees). Is that so? Sure you used modern glue so likely never an issue.
Dad would tell me to offset the pin hole. So it would go through the top joint and into the corner rails at an angle. We often used "horse glue" and "hide glue". The concept was when lifting up, there was side forces transferred by the pin holding in more directions. Moisture played hell with those glues and sometimes they failed. So if the pin was angled, you had friction to back up the glue. With bigger corners, the pin was angled more. So when you cut and sanded it, it was a "decorative" oval. Unless like me one time, drilled the hole angled the wrong direction so the oval failed to match the others....I was a kid, that is the excuse I'm going with.
The other really cool thing about these weave baskets / boxes, when you break a slat, you steam it out and steam a replacement in (unless you pinned the ends, that makes it a bit harder). Way Cool build.