Hello Peter
Whilst I can't speak for others, I would like to make my own position clear:
I was the first to comment on your opening post, and told you that I looked forward to reading your story.
Then, on page 3 of this thread, I tried to give some practical support; by mentioning how much detail of the structure could be seen on Google 'Street View'. … Your response suggested that you already had everything you needed.
… so, since then, I have just quietly admired what you are doing.
Keep up the good work, and please keep posting.
MichaelG.