Hi Ade. Nice to see your 7MM Malmesbury Layout. I Live in Malmesbury and am looking at starting a N Gauge version which i have been meaning to do for years. I have Mike Fentons book
From when he did a talk here at the Town Hall.
Just thought this might give you some help with the scenery. It is a youtube video from a train simulator game and it is all the Malmesbury line to Little Summerford.
Will be following your build with interest. Great work.
Rgds Chris