Quick 3D sketch of an idea thrown together at 4 AM. Not very impressive? Nope.
It's a storm-drain idea... it seems far too unintimate to me now that I look at it. Something smaller and closer is probably what I'm going to go for. Maybe a single wall of a stormdrain-
Perhaps something like these:
https://www.infiltration.org/drains-first8.html
https://jimmyhalfway.blogspot.com/201...n-runcorn.html

Regardless, I'm pretty set on some sort of storm drain. So, more concepting tomorrow, or if I get confident, perhaps I'll start the actual model.
We shall see!
Regardless, I'm going to go for a current-gen gaming polycount and specs. I'll probably put it into UDK if I have time, too, for my final pictures.
But, getting a bit ahead of myself!
Update tomorrow.