So, I have just spent the past hour reading this entire thread...best hour I have spent all week, I must say!!
Don't know what else can be said that hasn't already...truly a massive effort and great results so far. I am really into this idea of using solar tubes in lieu of powered lighting. Aside from the obvious savings in costs, it just looks so much more natural and effective. I am also blown away with your plumbing...I tried to look closely, but couldn't see any form of guide markings on that mess of spaghetti you buried...how did you know which pipes to connect to where after the dirt went back in??
Lot's of very useful tips and tricks in this thread. Bookmarked for furture idea stealing...I mean reference!
Oh, yeah...that skimmer is just mad!!