Well, the sad face is mostly for the amount of work outstanding. It'll be great when it's done. Just one of those 'how much to do...' faces MDF is better at the edges, but it's made from layers. When you're putting screws in, you need to go across the layers, and not with them. Going in the same direction as the layers will cause it to split: I used small screws in this test piece. Larger screws would probably have split it right the way across.