Not sure how well it shows up here Keith but my ledge in the lower pond is a 2 level. Shelve cut out on top, then slanting at a 45degree angle for a foot or so leveling off at a lower shelf then straight down into a pit with no rocks. The pit is roughly 4x7 & the perimeter is 8x12. The advice from JW, Meyer & Cas is sound, with the ledge if it's uneven it won't matter so don't sweat it. As for the fear of leaving behind/losing fish, I used to tell myself with my old koi I wouldn't be upset if I lost them as they were cheap & easily replaced, all true except the color of each one so I fully get it! I'm still looking for new ones. But as for what you've left behind don't worry about it, you have just enhanced & brightened a 9 yr olds life! It's easy to forget that age (I forget already running into people with 2yr olds the difference) but having an 8 yr old I can tell you he will love it! Leaving it as you did has given him a ready made beautiful pond to enjoy daily. The plants you can easily replace. It's looking good so far! As for the liner, if you check my 2nd pond build in my thread I hauled that size up by myself in a confined area so I understand how heavy & tricky that is! I'd look for a garden supplier/landscape rock supplier with rock you like to fill in the sides. I still have plenty I've collected so I don't need any but I know a place if I ever do where I can fill up the bucket on a skidster for $60 only with whatever size I want from 4" up. Not bad considering Steins is about $4-5 for a 4" rock alone. Too bad you don't live 3 1/2 hrs north, I'd be able to give you a hand!