a) Significant modification of heights
Before we had -2200 mm of existing one and digging down to -4200 mm (plus specific hole for IS machine to -4600 mm)
We consider ax fixed the new heights you communicated of different floors with reference to glass level.
Just as a comment, from your sketch looks like there’s an ascending slope in the first part of the forehearth.
I think is only a visual element, because ,as you know, it is not possible to make elevation of glass level
When fixed in the furnace.
The new quote – 3770 mm means that it is or the existing one or you foresee to make a dig.