I've actually done around a hundred houses out there over the years. Kemp, Tool, Gun Barrel City are a few of the small cities around Cedar Creek. It's an awesome community and I love going out there. About an hour and a half south of Dallas on HWY 175.
Before we started with Bronze builders grade windows from the 70's. Fogged and pretty ugly.
To do these correctly you have to split up the out of square in as many places as possible. Half inch here or there, eighth inch here and there. I kept the bottom straight with the lowers and the top angle straight with the house. It was one of the more challenging ones over the last year or so.