First, let me say I really liked it was set in Chicago. The El, Sulzer Library, Irving Park & Ravenswood, even Wrigley Field--all very familiar to me. Mr Openshaw looks vaguely familiar but I don't beleive I ever met the model. 
 The concept's good, if sad at the end--a bookmobile filled with all the materials you've ever read (books, magazines, letters, diaries, cereal boxes...), but like a real bookmobile/library, you can't spend all your time there. But when you bump into it at night, you can go in, spend a little time with your memories, maybe be inspired or find your vocation. 
 Like the main character, I think I would like to work for The Library (the one the bookmobiles are run by) eventually. But I shan't hurry the process!