Wow, thank you Weazel.
To people struggling about doing a second aisle behind the first I wrote that you always have to consider the grid. For example, if you want to have a layout like that
spaces
1 XXXXX row 1
2 XXXXX row 2
3
4 XXXXX (row 3 relocated from 4)
5
6 XXXXX (row 4 relocated from 6)
so it’s like: 1.1-2.5, [4.1]3.1-3.5, [6.1]4.1-4.5
The last aisle is relocated starting from #6, even if it is row #4, because you have to count all the spaces in your grid. Hope this could help other people.
Thanks again.