Hi Francesco!
This looks fantastic!
A small question. It’s a bit of an edge case but especially for larger mosaics at higher declinations the rotation angle of each tile actually changes by a few degrees against the rotation angle of center image. Normally this is not noticeable but for some cases it means that if you use the same camera angle for all tiles then you have to use more overlap and crop. If you want to have a look as to how much of a difference it is, you can use the Pixinsight MosaicPlanner script (if you happen to have PixInsight) which has an option to ‘Adjust Tile Rotation’. As mentioned this becomes more of an issue the higher you go in declination and because most large mosaics are taken further down it isn’t noticed very much.
Maybe something to put on the list for a quiet time 
Mike