As others have pointed out, I think the biggest weakness is the seams. It looks like it would be impossible to write on. I would suggest that you include some sort of optional desk pad as an add-on.
I'm from the US. Although it doesn't look like you're shipping here yet anyway, you might include inch/pound units too if you plan to ship internationally at some point.
Cool concept, good luck.
EDIT: Here's what I meant by a desk pad, in case it wasn't obvious. This one has a lip so that it stays put, and a metal backing so that you wouldn't feel the slats underneath while you were writing: https://www.ikea.com/us/en/catalog/products/40246156/