Woody,
I assume you used the DKM dough recipe at
http://www.pizzamaking.com/pizzainnstyle.php. If so, and you followed the directions explicitly, I think you should have seen some bubbles in the crust. It's possible that the cookie sheet you used was not the equivalent of the cutter pan that the recipe specifies be used, or possibly your dough skin was underhydrated and a bit on the tough side, especially if you used volume measurements. You might also think about using a much longer fermentation time to see if that helps.
There are also a lot of tips on making the DKM cracker-style pizza, including different baking methods, at this thread:
http://www.pizzamaking.com/forum/index.php/topic,5762.0.html. There are also useful "DKM" threads at
http://www.pizzamaking.com/forum/index.php/topic,105.0.html,
http://www.pizzamaking.com/forum/index.php/topic,7872.0.html and
http://www.pizzamaking.com/forum/index.php/topic,779.0.html, among others.
Peter