Ya know...a bit less time posting on MFK, and a bit more time playing the banjo...i.e. wielding the shovel...and this project would be a done deal.
I hand dug my 9 x 15 foot pond, between 30 and 36 inches deep, in three fairly relaxed days in the autumn of 2015. Another day to sculpt the contours of the bottom, lay down old carpeting for padding, install the liner. And, yes, we have heavy clay below about 15 inches. Then two more days of schlepping about 800 feet of hose into my back field to the natural pond, extending it down to the new backyard excavation, and carting my generator and pump out to the natural pond to start moving water.
It's amazing how much you can get done when you aren't stopping every ten minutes to post about how little you're getting done.
It's also helpful to use some of the latest and greatest technology to assist you and make the job safer and easier; I'm talking about high-tech innovations like workboots for your tender tootsies and maybe a pair of gloves in case you pick up any tools at some point.
C'mon, pick up the pace, Tiger. At the rate you're moving, half the species you are considering will have gone extinct by the time your pond is full.