We have a one sided galley kitchen and the only way to enlarge it is to take a very large picture window out of the kitchen and replace it with a smaller (4 ft) window. That will allow cabinets on that second wall. The problem is that the house exterior is brick and my question is: what to do on the exterior? After installing the smaller window, there will be a gap on either side between the brick (hole left by larger former window frame) and new. There will also be a gap below the new window as it will be shorter to fit above the sink.

We will be remodeling the deck area as well, adding a cabinet, maintenance free decking etc. so some material might be used as a repeat to tie it together visually. Am I thinking along the right track and if so, what should the material be? Or is there a pseudo brick product that could be used to fill in?