I don't have Complete Saga, but for LSW2 Original Trilogy most of the mini kit models are identical to the actual mini sets that LEGO released in 2003/2004.
E.g. the AT-ST and Snowspeeder are from set 4486
. So you can build them with the instructions provided by LEGO
:http://cache.lego.com/bigdownloads/buil ... 193296.pdf
(Note that some unique pieces are used, such as the printed flap for the AT-ST's "face" which is only available in that particular set.)
The Millenium Falcon is identical to set 4488, the AT-AT is identical to set 4489, etc. Some of the models, such as the Sandcrawler or Sailbarge, have not been released as sets so there are no official instructions from LEGO. You'll just have to play the corresponding level over and over again and pay close attention when the kit is assembled on-screen.
About those mini kit canisters - I have tried to build some myself, but one of the parts does not exist. The lever/antenna is attached to a part like the Modified 1x1 Plate with Clip Light
with the clip rotated 90 degrees. According to BrickLink such a part does not exist. A 1x2 Plate as substitute just looks crap.