I started getting into this last year, I wanted something easy to maintain. I welded a frame so my cages hang (2 levels) with coroplast to redirect waste from lower level rabbits. It has been super easy to clean, just hose it off every now and then.
I built an automatic watering system using an old ice chest, in summer I just dump in some ice, and for winter a submersible heater & livewell pump circulating it so its freeze proof.
If that makes sense.
Oh man ... I need pics of that watering system ... Actually would you mind if I came and "toured your facility"?? I'll bring bread ... and cookies ... and whatever else I need to bring to bribe you! That sounds like a GREAT set-up ...