Here are some attempts since the demo. I thought I was doing well until I went away for a minute after finishing them. When I came back the boxes look distorted and the red hidden edge lines really made it worse for me, as the boxes can change there appearance with them drawn in. That said I think the red lines emphasise the distortion of the boxes I've drawn. I need a lot of practice on this but would like to think I was practicing good methology than wrong. Any advise to help to sort out the head box thinking to address the visual errors would be much appreciated. Thanks for this great exercise.