This plan included multiple towers built over West Street, with a 2001 feet tower standing on the current site of WTC3 and WTC4. All buildings would be built with a high line of sorts starting from Battery Park and ascending to the center of the former WTC complex. This line would run across two buildings (WTC1 and WTC2 site) to the actual tower.
The book contains two pictures of the proposal or concept, with a detailed description.
Edit:
Could not find any pictures of the proposal or concept on the internet. In the book there are two: the photo of the model in the skyline and the computer image.
I stitched the two images of the rendering of the Bank of the Southwest Tower in the Houston skyline. From the book Southwest Center The Houston Competition, published in 1983