SolidBody to simulate custom brick aggregation?

Hi,

I'm developing a CNC machine to wire cut bricks as they extrude from a ceramic pug mill. I developed geometry in grasshopper and am ready to begin production on a section of wall, but I want to know if it will be able to stand up without mortar or other fasteners. I've tried with both Kangaroo and kangaroo2 to simulate the bricks with basic gravity load, but can't seem to get it to work... 

I've tried various configurations of SolidBody, using the volume to determine the gravity load located at the centroid. Whenver I turn the simulation on, the bricks fly off in all directions... I also took a stab with old kangaroo and a meshCollide, but I'm not sure what the best method to use is... if there is one

suggestions?

Oliver