This is an example of a double up.  What you see here is the orginal model.  It took about 40 hours for me to build.  It was the first model I ever made that was used by LEGO Systems, Inc.

This is the same model only with eight times more volume.  We would take a smaller model and double every deminsion.  This model took around 60 hours.  Why not twice or even three times as long?  Easy.  A LEGO brick doubled on all dimensions is a DUPLO brick.  <grin> 

The hardest part of this model was the Ice Cream cone.  That is made completely of pink plates in sizes 1x2, 1x3, and 1x6.  It took almost 12 hours to make and I nearly went mad looking at all that pink.