Great idea for an angle. I like how this is so sharp, and how the lines draw us back into that triangle hole. There's an awkward amount of bridge on top, I'm not sure if I'd prefer more or less of it. I think maybe less, like right around where it switches color. Oh, and good two-tone look.
the sepia toning is a nice touch, but the extreme bright spots in both the botton corners throws the balance off.
I like how the DOF goes on for as far as you can see.
Wow, I'm reminded how photogenic riveted structural iron can be. The exposure is perfect. The lines are strong, the rhyth effective, the vanishing point perfectly placed. Very Nice.