The layout looks great, I think I've had this in my fav folders from Brickshelf for some years now.
Out of curiosity, what do you use for your ballast, as it looks quite large? I used cat litter, but again I feel it was too large, it looked like rocks rather than stones compared to traditional model railway scale ballast.
I really like the led usage, I purchased many some time back but never got around to getting them fitted.
Again, out of curiosity are your signals 12v LEGO ones, or MOC's with LED's?
Do you know, or do you think you can estimate how much money all the 12v stuff has cost you over the years? I have quite a large collection of it now and I know roughly how much its all cost, its quite frightening!