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1a, 2aExisting window is framed in 2x4 wall with 1x6 'framing' and 2x2 trim on the outside. I want to replace it with a picture Vinyl but since the sill (stone) is higher than the frame I'm thinking I may have to leave the 1x6's in place and order a window 1/2" less than the width and height then cut off the flange. Question is, how do I securely attach it to the building or is there another approach?