How are you liking your 4-6105s? My current build is going to have a tank almost the same size only 6" shorter in height. Right now I'm planning on the same 4-6105s but am also considering a pair of 6255s...assuming they ever come out.
BTW, looking good so far, I'm planning minimal rock maybe not as little as what you have but along the same lines. Mine is also planned to have lots of tangs too!! Can't wait to see this progress.