Yes!  There is a book on the Wurlitzer 105: complete plans.
I got it some years back from Vestal Press:

  Band Organ Building Plans 104/105
  by R M S Stanoszek
  1980

Les Higger

 [ Updated plans are available from the author:
 [
 [   Bob Stanoszek
 [   17641 Sagamore Road
 [   Walton Hills, OH 44146
 [   tel. 1-330-467-8271
 [
 [ -- Robbie