I know it sounds a bit odd as the station was under a giant slab of concrete but New Street did have canopies in the traditional sense, although typically utilitarian.  The ones furthest from the front of the layout are the easiest by the virtue that they are straight so that seemed like the logical place to start.

Above shows the top side (that you wont be able to see) but demonstrates the construction which is standard 6mm foamboard. The outer edges are 30 thou plasticard scored at 30mm intervals to represent panels. The reason for the 2 rows per side of foamboard is its easy to drill a 3mm hole through the inner one and pop an LED through (I use cheap strings of Christmas tree lights to save a lot of soldering).

This is the underside.  The ribs are just evergreen board and batten sheets, the whole lot was sprayed black and then sanded to get back to the black and white pattern. The cutouts are for pillars and structures on the platform which will need to support the shopping center above.  By using foamboard you can position it on the platform and then press down to get an imprint of where the holes need to be.  Below is the finished result which I feel captures the feel of the place before its facelift in the early 1990’s.