Sent him a OPIX 8X10 of Jabba's Sail Barge, SAE, and a letter on July 29, 2011 to ILM:
P.O. Box 2459
San Rafael, CA 94912
Got it back, signed in black sharpie, on Friday, July 13, 2012... just shy of a year later. Worth the wait. Thank you Mr. Huston and Wattographs.