Revision to Plan

So, a revision to the original plan: use the compacted cars as a porous material around which to pour the cement-concrete mixture. What is the advantage? Used the cars as fillers and save money on amount of concrete necessary (as the car would take up the majority of the area), remove materials that cannot go into landfills from communities, and secure the wall more with a heavier matter. Still planning on the mosaic facade, but definitely upgrade to cement and car type blocks. Will draw a diagram and post it pretty soon.