Right side upstairs: converting windows in to french doors to balcony.

This is my first bash. These two windows look out on the balcony, and I decided to turn them in to French doors instead (so there was an actual point of access for the balcony, via the master bedroom). You can see here where I made the cuts. The problem: merging these two windows left me with a 17 cm hole, and the Houseworks French doors were just under 13 cm wide. I'm a newbie and don't yet feel confident making my own hinged doors, so I decided to buy the Houseworks ones and build on sidelights.