I got this idea when we were assembling city advent calendar from 2011 and it was not only 24 mini models, but some of them had to be combined to get some larger models.
From a technic advent calendar I would expect to get 24 submodels of something that will be finally assembled to one complete model. Each day 10 parts to add to larger model. Just like when you get parts as an extra to your favourite hobby magazine and you assemble them whole year. Of course a building guide printed only on calendar windows can be tricky.
I know it's a bit silly, since advent calendars usually contains Christmas related mini models, but StarWars advent calendar does not. This one can contain one larger model related to Christmas or winter (or even unrelated).
It's not that attractive for TFOLs or AFOLs, but for kids between 8 and 10 it can be a good option after two or three years with advent calendars containg allways city minifigs and trees.
Edited by hrontos, 08 December 2012 - 10:51 PM.