I think my problem with casting for Repairman Jack is that I don't see how any current actors could play a character who doesn't stand out. All of the current actors in Hollywood are there because they stand out in some way (I was going to say "are designed to stand out," but that sounds too creepy...although...designed celebrities...hmmmmmm), and by the time people realize that they are good actors and looks don't necessarily matter (i.e. Harvey Keitel, Robert DeNiro), they're too old for the part.
I will probably go see the film when (if?) it gets made, and then I will reread the book and watch my own movie--in my mind. The special effects in my movie will be killer awesome, dude!
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Anyway, that's my two-hundredths of a dollar worth.