Changi Tower is situated in the Nangma Valley, Baltistan, Northern Areas of Pakistan. Six hours drive from Skardu will bring you to Khande Village; from here you can reach the base of Changi Tower in eight hours.
Changi Tower is part of Amin massif (Amin Brakk, Changi Tower and many other unclimbed spires), enormous granite block in the upper reaches of the Nangma Valley.
For quick reference please check American Alpine Journal 1999 page 395 and 396. A month trip from Islamabad to back Islamabad will be an ideal trip to draft.
Porik with Ricardo T. Navas International K2Expetition at Concordia