Part of this level involves using a basher and a miner near the side of the level. This screenshot shows just this part of the solution.
Screenshot of full solution (will definitely spoil almost all of solution)I tried putting steel on the edge but it didn't look very good. As you can see from the pictures, the solid sides help. However, I've provided excess builders (as you can see from the full screenshot of the solution), so if the sides WERE deadly, you could turn the basher around with one of those.