I'm going to share with you my idea of my first route. It's called East London Lines and it is a slight blur between fictional and prototype. The original idea was to build the East London Line in it's Pre-Extension state since it appears to be easy to build, am I right? Then upon discovering its links with Liverpool St. and Broad St. up until 1970 I wanted to depict that too. This is where it gets fictional... I'm not a big fan of Pre-BR Blue Grey Period so instead why not bring Broad St. into the NSE Period!
The idea isn't concrete yet as I may plan to extend.
Replies please, James.