Hello again Paul.
Please ignore my previous post, I now realise I was being rather lazy!
I have since downloaded your "final" JPEG, scaled it to a width of 24 cm (aka 2.4m), and printed it off. The definition doesn't allow me to read the actual track section codes, though I can see they are a mixture of Hornby and Peco!
So, now I can start the plagiarisation. I am going to stick with pencil and paper and my college drawing instruments( but I've left my slide rule in the loft).
I've also cleared an area on my living room floor (stripped pine boards) so I can prototype "segments" of the whole thing bit by bit. Just waiting for my 4th radius curves and WS inclines to arrive ...
Meanwhile, my lovely children are taking me on a steam excursion from Euston to the S&C as a birthday treat, so I'll be able to get a feel for the real thing ...
Regards. Roger.