So much easier than the one I started to make a couple of weeks ago from scratch, from foam core, loads more measuring, and I took a slice out of my little finger too - dripped lots and it throbbed for quite a while after. Kept it bandaged for a few days to let the flappy bit adhere back onto my finger. Still hurts now if you press it.
Well got round to covering it today - went over all the edges/corners with gummed tape to hide the corrigated bit and give the edges a better finish. Then put some card on the base and back to cover the uneven bits of the box, and finally covered with papers.