Haha that’s funny a buddy of mine and I did something almost identical to that about 8 years ago. Ours rotated a lot faster, went through multiple layers of rock, we pumped a slurry to flush it out, and stopped around 120’ or 130’. He still uses the well. It was all homemade and something I will never forget. People were amazed that we used an 2 or 3hp electric motor from an old water pump.I really like that machine! Nice and simple and cheap, yet very affective. Well done!