you can make one of mine and then work on how it works!
i have about six other tansformers iv made you can see them. but when i make one i allways use a knex man so no matter what it move good just click on to see here are 2 of mine
get some knex pieces and llook at pictures of the toys then look at the mechanics of how they transform and try make the mechanism and build the mechanism then the design (back/front) and join together.
What I would do is base it on the actual toys if you have them.
Here are a few different transformers I found on KI.The first one has instructions.The second doesn’t http://knexinnovation.net/forums/viewtopic.php?f=4&t=553http://knexinnovation.net/forums/viewtopic.php?t=621