Ten years ago, I saw a study showing fairway averaged $5,160 per acre (as Bradley notes, after establishment) vs. $546 per acre for native plantings, or about 89% savings.
Thought the article had some differences between fw and rough, but was wrong. Between the extra $30K chemicals for bent and mowing about half as frequently, I suspect the cost would be about 2/3 of fairways overall, depending on how you allocate some general overhead. If so, then converting half of those 65 acres to rough, would probably save $50-60K per year on average, perhaps a bit less.
Mike,
You have to presume that is a rendering, and the lines would be reviewed in the field.....the first thing I notice there is that the 2nd and 17 greens are the same shape at different angles.....more problematic, I think. I wonder if 1 and 18, 3 and 16, etc. are also the same shapes for "balance?"