I don't appear to be able to edit my original post so answering some questions and adding the missing photographs here..

timmmay:

 

When you edit your post to add the missing image please rotate the images. It's more difficult to view / understand when it's sideways.

 

Froglotion:

 

As for the scribers, a builder could custom make some to match what you have. They look to have just used the ones that come with Linea cladding

 

Based on the off-cuts he left these were made by him, I just dont know why he wouldn't have used the old scribers as template though but perhaps I am too naive.