You all inspired me to look harder and I found another contractor to talk to today. Same price but a lot more experience building ponds and wants to use a sheepsfoot roller. I’ll be asking for references from both. They both got nervous when I talked about a siphon system. As much as I like the idea of drawing oxygen depleted water from the bottom, they’ve got me thinking that I may be asking for trouble later when debris or silt clogs the intake at the bottom. Would love thoughts from those with more experience than myself.