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See if you can convert a typdef struct into a byte array and skip all the bit shifting. For some ideas see:
http://stackoverflow.com/questions/2692383/convert-struct-into-bytes

One method that seems promising is:

typedef struct b {
  unsigned int x;
  unsigned int y;
} b_s;

typedef union a {
  b_s my_struct;
  char ary[sizeof(b)];
} a_u;

For the wire.h master, if the slave is turned off, the sketch gets stuck, need to see if there is a timeout.