Thanks for the comments guys
Mr F, I've moved the lap timer sensor to the end of the return straight so's not to miss any laps but I'm happy to leave the lane changers with that possible risk of missing the sensor as it will mean you need to think more carefully for lane changing/pit entrance. some of my cars are not magless but they're older and have very weak magnets in them which means they're a lot of fun at the same time the modern mag cars are ideal for my young family and novice friends of mine.
Ember, well spotted.
Michael, my previous set up was without the big straight but did include split levels and I found certain cars, especially F1's didn't like the change in gradient much so this is a bit of a compromise, I've got in my head for scenery that this track has come from a converted airstrip or similar. The standard scaley barriers will be slowly replaced for more realistic scenery only where a real track would prioritise to have it.
Keeto, nice! I like the chicane in the main straight and am tempted to try and fit one into my main one or the shorter return one when I get some more track, R4's maybe.
Richard, you're welcome whenever, i'm off for a few days at present until next week, I need to see the latest on yours.