Hey Grit, Be careful of engulfment, wall collapse. If you are going to get serious, protect from rain and rain runoff. Soil density plays an important role in wall slope v depth. A tripod well wheel can aid in debris removal as well as rescue/retrieval if necessary, but must be robust. The tripod will only be useful if you have help on site. The bottles will wash up and look great after being dug up, we don't always fair as well.