I didnt see a response on this one, are the kallistra mountain hexes just L1 hills or just an impassable pile of rocks?
Sorry mate, I've been quite busy of late :)
Yeah, the large hex shaped hills with flat tops are made by me from 25mm thickness foam sheets. Each level is equivalent to 1 level.
The Kallistra hills I use as impassable terrain, however they can be jumped or flown over ofcourse. Whenever drawing LOS over these, I take the highest point of the hill in which I am drawing LOS over, and round it's height to the nearest inch, and that is it's level. They range from level 1 to 4 depending on what hex you are drawing LOS over.