Hi Davey, just had a quick look over your thread. Surprised to find it was O gauge given this folder is not for O.
I would expect to see it in the 2 rail folder. That is mainly where I look on this forum as I have an outdoor 7mm scale layout.
You have certainly given yourself a big task building it the way you are doing it. However, perhaps in Scotland it is necessary for longevity :>
Wish you all the best with your family health problems.
I'll pop back sometime and check out your progress.
cheers
BobC