Thanks for all your efforts!
I think I am going to take a step back on this idea for now, at least as a hard mode tank.
I am not new to tanks or tank builds, having a couple nicely IO'd out tanks as it is, and have used them in an array of content. I figured some hardmodes were the next step. But, after leveling the character and enjoying it in its present incarnation, in terms of powers and basic play style, I am not sure I am ready to make the sacrifices one needs for optimal hardmode content. At least with these powers. Besides, I've never done any kind of hard mode, so no reason to hurry on a build.
For now, I am going to take this build and flex it into a "lesser tank" for now, and possibly either respec or do a second build if I feel the need to take that step. Either way, I do appreciate the build, as I am going to get use out of it one way or another!