OK Tink, what I see in your pics is a beautiful spot for a linerless mud pond.
What I would do is figure out where to put your water plants while you drain out the pond with a syphon. It looks like you have some land that is way below water level below the pond that the syphon could run to.
It looks like your soil is ideal for packing and would be water tight.
If I was there with my tractor and blade I could build a beautiful pond there in an afternoon or less. I built a pond bigger than that for a neighbor once and it took about an hour, but it was a simple round pond on flat ground and all I had to do was drive around in circles with no backing up or anything.
The problem is that I'm not there with my tractor and blade, and if I was I wouldn't have time to do it because of all of the work I'm drowning in. I have a friend with a car hauler truck that would haul my equipment over there but I have no idea what he would charge to haul it there and back.
The idea occurs to me that if you had enough free time to work for me, enough for me to get ahead of the tidal wave of sprouting seeds and plants that need planted and divided and fence that needs to be moved to keep deer out of the vegetable garden and ripening pods that need to be bagged and bags of ripe seeds that need to be brought in and washed and bottled and labeled and recorded and pools that need water change and clean out and shade cloth support built for seedling pools. You get the idea. Then maybe we could trade work for work. That's if you could afford the hauling cost.
Another idea is to leave things as they are until I get ahead of the big wave of things I have to do, like Sept or Oct and you could pay me to come out and build it you could somehow put your plants somewhere during construction and refill.
What is it like to the right of the pic where it turns into brush. Does it stay kind of level or drop over a hill and get steeper or what. Because I think I see enough room for twice as big a pond as you have there. Also what's to the left in the pic?
One more thing, did you dig that by hand ?