Michael, You did a great job on the yard, making the most of the space you have available. You made such good use, I thought you would have cars sideswiping coming out of the switch curves, but I'm sure you checked that all out. I agree, you need to do everything you want to do before putting in the second level. I have forgotten how high it will be, and how much clearance you will have. I could have put more clearance on mine, but that would have made my grades even more than the 4% I settled with. I'll look forward to seeing what you come up with.
Take care and God bless, Mark