By "line drawing" i'm guessing you mean stippling or blue print type drawing. Try googling "Medieval Islamic and Gothic Architectural Drawings". I was researching trying to find something to help you out and came across a paper by Arash Etemad Yousefi, submitted to the Dpeartment of Architecture in Partial Fulfillment o the Requirments for the degress of Master of Science in Architecture Studies at the Massachusetts Institute of Tecnology, June 2005. It had 69 pages and the last several pages had different images that may be able to help you find this drawing you are looking for. Good luck!!!!