A door for the run
This is the original metric version of the plan (millimetres/centimetres). See also Chicken coop plans: Imperial (feet/inches).
The front end of the coop will consist of a large door/gate, to allow easy access to the run (cage) part. This door will need to be braced diagonally across at least two corners, to stop it changing shape after you fit it.
Measure accurately with the door, and make sure it is square, so that it fits in the frame and opens properly.
Don't worry too much about the size of the diagonal braces, as long as they are large enough to provide the strength you need. We suggest each one should be 400mm to half a meter in length.