Id:2946672 works. You might be able to learn some things from my azure challenge walls. As I mentioned on another save of yours, using the Subframe Chipmaker Script is something I recommend.
My solution: id:3133965 - 3 pixels - one if it doesn't have to be an azure.
Mini_nuke_mistro:Actually,This bunker is not build for resisting cray,dray,bomb,dest,... bombs,it's build for azure bombs
I think that most cray like penitrators will go straight though