This link is for a class on the Sharh al-‘Aqidah al-Nasafiyyah. In the third volume or so there is a discussion on the istiwa’. If anyone finds it, please let us know.

I’ve provided two versions of the book as well, the first is the original book and the second is a tabwib into fiqhi chapters called Fath al-Barr:

http://waqfeya.net/book.php?bid=3566

http://waqfeya.net/book.php?bid=1225