I have made my first USB ICS cable and wrote up how I built it. You can find the information here:
DIY USB ICS Cable
Unfortunately between when I made my order and now the 3 common places I order hardware from have no more stock. Mouser shows that the 5V USB TTL adapter will be in stock again in 2 weeks. I included information on how to build the adapter using a 3.3V USB TTL adapter but have not verified that it will actually work. I am building all of mine using the 5V version.
I plan on making 9 more of these, hopefully this weekend, and will post them for sale.