Only problem with latest plan is all the backing required to use the yard. My other impression is that the yard uses up a lot of space.
Last thing. When I come up with what I think will be my 'final trackplan,' I usually ask myself 'do I like it,' or 'will I be satisfied with this?' Also, 'can I build it?' Sometimes its good to step away, the revisit later, even if its only a day, or week later.
I know you're pretty far along with your plan, but I've uploaded a sketch, for you to consider. If you run your yard along the opposite diagonal, from what you've got now, you've got longer yard tracks. Maybe with fewer of them. Gives you other possibilities, scenically, if its doable with your minimum radius.