Man, it took me about 30 mins to read this WHOLE thread! everything looks great. I really want an indoor pond now. although i might be tempted to do an entire indoor discus pond. THAT WOULD BE SCARY!
I liked the cap idea for sealing the pump intakes. Smart. Everything in your setup was done with a lot of though, i can tell. You definitely made things simple so there would be less complication later down the road. I definitely will be building a 1500gal someday.