I would like to ask you to post the parts needed and also if you did a small drawing. I've asked the mods about this. They agree, since you are not personally selling, advertising, or endorsing a product/business.
We've had a little bit about small scale dredging before. I've tried it unsuccessfully with a semi-trash pump. A friend further discouraged me from doing it with a semi-trash pump, saying the grit in the silt/muck would quickly wear out the pump impeller. If I had a system I thought would work, I'd rent a trash pump for a day.
Ken