So, work begins in this step on the base. In my mind, I imagined the hammerhead emerging from the wreckage of a building that had been destroyed. One thing that i always find with 40K scenes is that there is never enough wreckage! In general WW2 models get it right - lots of rubble and wreckage - for example, just consider how much plascrete and other materials would be in even a simple small building.
Step one was to cut a piece of thick blue foam to the right shape. I wanted the front left to be a shell hole, with the wall / sidewalk and road and a slightly open area towards the back. The highest point was going to be the hammerhead hovering just above the ground. This gives a nice 3 level effect, which, again, is a technique I've learned from the WW2 modellers. The aim is to get three progressive levels of height moving backwards as the eye moves.
Once the blue foam was cut to shape, I then moved on to marking out the back of the building that had been destroyed. This was added with pre printed plasticard. The sidewalk was then added using a piece of scribed plasticard. Dont worry about the fact that there is a gap in the sidewalk, this area is going to be covered in debris!
Next the main wall sides were added. These were made from some off-cuts of plaster that i had left over from when i last tried casting. See here for more on that failure! Once they were stuck in place i stuck on some off-cuts of blue foam to bulk up the areas of rubble.
Finally I started to add the rubble. This is made from again the same plaster as the wall. In this case, I spent an evening in front of the TV breaking up blocks of plaster! Once i had a big box full of broken plaster I started to apply it to the base. Woodland scenics spray PVA was used to fix the plaster in place. I added the plaster in multiple layers spraying the area first, then applying plaster parts, and then spraying again. So far its had about 3 coats, I think it will need five or maybe six.