Here is the work in progress signal plan for the layout, it incorporates the new extension and is roughly blocked. This is by no means the final version as myself and Brendan have some work to do fine tuning it.
The main is fully signalled, and the passing sidings will be to, but mostly with dwarfs. It needs to be noted that I'm not following a prototype system, I'm not overly concerned if it also doesn't follow the RR's signalling systems that I'm modelling too.
We have decided to base the system around operationally what will work for the layout and its operations sessions. So if you pick up that there are signals missing from places that normally would have signals, thats fine we have countered it in our plan to have plant protected in groups in places. This significantly cuts down on blocks, signals and the hardware required for detection & signalling.
The next stage is to install all of the Tortoise Switch machines on the mainline, then connect these to the SE8C's via push button, momentary switches and get these working through JMRI. After this we will be looking at the wiring for the entire layout and reconfiguring this to work in with the common rail power for detection.