Mikkel, yes thanks, still digging.
The problem is that, despite frequenting Glasgow and south Scotland for much of the 70's I rarely had the inclination to travel by train let alone photograph - so it is one of those, many, stations I never visited. Therefore have no memory of the general arrangement.
Modern photographs are potentially not too much help - This layout is supposed to be 60's.ish in character and also I gather the station underwent quite radical changes in the 70's and again lately with the addition of a new platform. (platform 0)!
I am beginning to rethink my ideas about that station (not the model) layout expressed above.
At the Waverley end of the platforms are the entrances to the bridge/tunnels (with a road above) in the second photo ?
The station building and the footbridge from it in the third photo are positioned about half way along the platforms. ?
The other end of the platforms are open to the tracks. The platforms on a slight curve.
The location of the photographer in the main photo was therefore on the open end of platform 2 ? facing platform 1.
This, as I suggested puts the arrangement in mirror image of what I require for the model.
But then it was never intended to be Haymarket - it is just that retaining wall, station building/footbridge suits my layout
I will continue to seek a more complete (in period) photo of the station canopy area and footbridge.
As so often with these photos the photographer tends to clutter up the foreground with a loco ignoring the important infrastructure. It is the infrastructure that needs to be recorded for posterity - so easily forgotten.