Cedar Crest saw another recent renovation since the one mentioned in this old thread. I believe it was completed in late 2016. The greens were pretty much lost. The cost was around $1M and included a new irrigation system, MiniVerde greens, and reshaping of many bunkers. Definitely not a restoration, and I doubt much Tillinghast remains.
As mentioned, the course sits on interesting land, has a walkable routing, and an affordable price ($28 to walk on weekends). It is worth playing. While the area is a bit dodgy, there are worse in South Dallas, and the neighborhood directly by the course, while older, is kind of lower middle class with fairly well kept houses. The reputation of the area surely drives away customers, but I think it is a bit over-stated.
The head pro there, Ira McGraw Jr, received some acclaim a few years back. He had noticed a young area kid sneaking on to the golf course. He became a mentor, coach and ultimately a legal guardian for the young man. He went on to play golf at Texas Southern I belive.