Mounting the Case Angles
Subsequently, the Case angles are cut to the correct length. It is not necessary for the profiles to run fully into the corners. The length of the profiles are equal to the length of the panels, reduced by 2 times the width of the profile. So if you have one side of 60cm, then cut the profiles on 54cm, assuming you use 30x30mm Case angle (0100), see Figure 2.
There is no standard for the amount of holes in the Case angle and distance between the holes. It is sensible for the distance between the holes to be not greater than 15cm.
At best you use a rubber hammer to position the Case angles, which fall under the Brace for case angles. All other Case angles and the lower holes of the Brace for case angles are fixed with the long rivets (91412GE 4x12mm).