flying netherrack tunnel bore machine. The company specializes in producing roadway backfillers,Roadheaders, coal loading machines, claw rock loaders, backhoe loaders, screw grouting pumps, coal mining machine accessories, and boring machine accessories.
General idea sounds great! I have also trouble when tunnel bore stuck and i cannot see why but i think your solution will not work. I.e. in nether often there are blocks of lava, and even if you could see though tunnel bore you would not see lava, because of one block thick netherrack.