Great layout design... I especially like that 14 foot straightaway you've got planned. Knowing how quick these cars are these days, it always seems like such a shame when someone goes to all the trouble to build a nice, large, landscaped layout and a huge part of it is twisty bits.
I saved these two photos of a guy's basement track that was posted on an internet forum a couple of years ago. The guy was actually asking for input on how to add more curves as he thought it had
too much straightaway. I thought it was perfect.