Hey Ryan,
That looks very well set up and some seriously good filtration - have you incorporated any automatic water change facility into it?
I use a HMA filter which will auto drip and then overflow through a sump to avoid water changes.
I saw this pond on Ebay with the viewing window - any idea if he makes custom sizes or just the size you have and smaller?
How does it look being 36" tall with a 24" viewing window? is everything still clearly visible?