I do not know the exact distances and processes used for the Mainstream alternative (and sometimes even for my Solution)?

It is understandable that this data is not always available. In that case, fair assumptions have to be made and mentioned in the comments sections (for example, “We do not know the exact location of the Steel factory, we suppose it is located 300 km from the assembly factory and that it is transported by a van under 3.5t.”). The Technical Team will make sure that the assumptions stated make sense and that they do not give a specific advantage to the Solution or to the Mainstream Alternative.