I have 2 individual windows separated 18" apart. I would like to remove the 18" and make this into one hole for a large slider window. My home is block with stucco. I have had a construction contractor on site and give me a worse case scenario price since neither of us know if the header covers both windows of each. Plans of my home are not available from the city or the original contractor and my home was the only one built with windows like I have. I am concerned that if I need to install one long header (metal) will I be opening myself up to trouble down the road?