Im looking for peoples opinions here and some advice. Im currently about to have a window replaced with a set of french doors. The opening measures 1770wide an off the shelf set of french doors for a 6ft opening measures 1790mm. Talking to my neighbour do is a real diy enthusiast he says just cut the extra mm out with a 12inch grinder as its only around 20mm each side to give a little bit of space for the frame each side. What are peoples thoughts here please im unsure to do this or have a set made to fit the gap. I have uploaded a picture so people can see the opening.