Hello Gordon,
I just think the whole think looks superb,I had been lucky enough to see the buildings in situ on Peterborough and they are going to look just as good on your layout. The whole area around the tunnels just yells out "Kings Cross Approach" and so OK to the purist there may some technical errors,but for me and I would guess a great many other people that Signal Box area is the DOGS.
I do hope to meet you at Ally Pally at the BRM Show,there can't be that many people of your height so I have a far chance of spotting you.
Kind Regards,Derek.