One other aspect to to try and visulize. When properly done the 1/2 Cuban 45 degee line wll not look the same at the end of the box as it does right in front of you. The line will appear to be at a sharper angle when it is further away from you when done properly. A common mistake made by pattern freshman. You will have a tendancy to make the 45 degree line too shallow resulting in either a too low of an exit because of a constant raduis loop or you will be pinching the 5/8 loop to keep the same altitude. A point made to me by an FAI pilot. In the lower classes up through advanced there are several areas this manuever is executed either reversed or normal. And the exit should be the same altitude as entry.