It's a lovely tank, but as you've noticed doesn't come without it's downsides, light penetration, "gliding space" (for Tangs), and being that deep you're not going to be able to reach the bottom of it.
The 160W razor won't have a problem punching down to the bottom of it, my tank is 2 foot high, and with 100% blue 75% white it's still a bit too bright down the bottom. I'm going to reduce it further.
The reaching to the bottom thing will really be an issue, once you've reached over the edge of the plinth, your fingertips will still be 4 inches from the bottom, even with pretty long arms... Picking and moving corals with grabby arm things can damage them too...