I found your project very interesting.
But I've some concern about the performance in a big Diorama. For my LUG I'm a Project Manager for our City Diorama. The last Diorama had a dimension of about 75 sqm, with 7-8 trains running at the same time. The 9V tracks are very expensive now and the PF system isn't the best system for a big diorama (IR is terrible for long distance, but it's perfect for a toy, we don't forget LEGO is a toy for children).
According to you, is this brick a good solution for a diorama with the same dimension?
One questions: for a perfect train layout, and a beautiful train automation system, the most important items are the sensors, because with these you can control all the trains, with start, stop, ecc ecc...
What we can do with sbrick for this?