There is a lot of good stuff in this book. Very inspiring.
I'm not too good at telling what is and is not supposed to be abstract in the dungeon layouts presented. For example, the pyramid has a lot of sheer drops. I know that the humongous Pit in the center is meant to be seen as so, but is it true for all of the huge drops into caverns in this book? Or am I supposed to use it as a rough guide for placing stairs and other less violent means of descent?