After thinking about adding an interchange siding, I set of on a conquest to add hidden staging. I should have planned this from day one, but thankfully there were a few good spots to add tracks without too much trouble. Better yet, I had a few spare turnouts, all of which were the correct size and orientation!!
On the main, approaching Jonestown I have added two turnouts. The one going towards the wall gives me about 3m in length, and will be hidden by a low backdrop panel. The one facing the yard will sneak down and around the layout, before splitting a a set of points and hiding under the elevated section, giving two 4m long staging roads. I am also extending the head shunt at the end of the photo and this will lead to staging also (single 4m track).
Looking the other way. I laid this siding this afternoon so will post some more updates soon.
The other staging track (and original interchange idea) was from Heidiville. This track will go through the backdrop and sneak long the raised section and wrap around the back of the layout, giving another 4m long staging siding. I did this siding in concrete sleepers so it looks like it is a different network connection.
So, after a week of thinking, I have ended up with 4 x 4m staging tracks and a 3m staging track, making it seem like there are lots of different connections to my little train world.