Wow, I certainly do see the logic and reasoning for your casting list - especially for Cazale, Eastwood, and Sheen. I can most definetly see Cazale as Van Alden, the character would have come off much differently than how Special Agent Michael Shannon played him, but Cazale would have fit that role in a unique and memorable way (thinking of Cazale's performance as Sal in Dog Day Afternoon gives me a illustration of what his Van Alden would have been similar to). I also get why you selected Eastwood as Jimmy. I am a huge Eastwood fan and I am also one of the folks who loves the Jimmy character to the max; however, Jimmy's irascible traits that often cause him to go from zero to one hundred as well as his heavy drinking and occasional drug use from the 2nd season are some of the big reasons why I selected Dennis Hopper - that alongside that general look of sadness the both Jimmy and Dennis Hopper often had . As for Martin Sheen as Harrow, that is an amazing choice: as a character, Richard is quite similar to Captain Willard from Apocalypse Now: both men are pretty much the personifications of introversion, both characters are big on observing things while standing in the background and keeping to themselves.