Make all objects/blocks that typically clip against each other by default a tiny bit bigger/moved so this doesn't happen. For instance the iron bars clip against the floor. A fix would be to somehow render them a bit higher. This would save the insanely annoying workarounds like running McEdit and trying to delete everything from the schematic except the iron bars and then place this mess on top of the schematic which you would have to previously remove all bars from...   Same for cons