Now you have your opening measurements, for the Aura system, divide your space into either 575mm or 925mm sections for every 550mm and 900mm wide accessory. Aura posts are 25mm wide - for 550mm wide accessories with 2x posts, the width will total 600mm. For 900mm wide accessories with 2x posts, the width will total 950mm.
For the Relax system, divide your space into either 580mm or 930mm sections for every 580mm and 930mm wide accessory, Relax stanchions posts are 30mm wide - for 550mm wide accessories with 2x posts, the width will total 610mm. For 900mm wide accessories with 2x posts, the width will total 960mm.
Start with one column on the left of your space and then add on additional columns until you have filled your space.