Modelling my City Scene – what to do?

My first US layout had a city scene with elevated track based on the High Line in New York. I rescued that elevated section and used it as a feature in my current layout.

The whole side starts with a mill complex – the NEBISCO (New England Biscuit Company):

and runs down a hill to the city section:

In between the front city section and the rear is the main line in a cut as it rises from the storage level.  This will be faced in Wills stone sheet eventually. In front is the bikini car wash, a garage and a diner:

It rises at the end though a complex based on the New York High Line:

There’s a bit of work needed 🙂

And finally runs into a raised corner:

Now here’s the question:

What do I do behind the Main Line Cut?  It’s only a few inches deep.

I was planning to do a series of roads at right angles ending at the cut with side on buildings like this:

Now I am wondering how realistic I can make that.

The High Line complex is huge so I can make it take up more space along a bit and be a more imposing structure.  If I do that, should I just put a series of backs of factory buildings along with the odd bridge across.

I could add fire escapes and a narrow path before the actual cut.  The odd taller tower could jut up as a photo.

I’d move the existing buildings into the corner to add a more city section:

At the moment it’s a blank canvas but I’d love some feedback on ideas to ensure that I get this right.

What do you think?