There are a lot of retaining walls failing around here too. Mostly RR ties type. What I did was find a good stone guy and just sub it out to him. I've done a few and made some pretty good money doing it. Im just getting started in LV lighting. I have two jobs lined up. Find a local distributor and see if they can help. I used a local irrigation supply company that sells Cast and other brands. I went to a 1 day hands on seminar where we did and install. I don't know about ponds but I've done some water features. Real ponds from what I've read and observed is a very specialized service. I got way too many things going in myself but if a customer were to ask for it, I'd go to a supply store and get a reference. Sub it out. Landscape is what it is. If you don't know what your doing, you'd better have an appetite for learning and a lot of support. Find another landscaper who can help you with questions. Networking is priceless. that help?