Just a thought, instead of 2 small peninsulas, why not one wide peninsula that would allow for a great variety of track configurations. The two small peninsulas (and walk ways) take up a lot of space, and don't give you many track options.
If the one large peninsula (76in below, but could be shortened) is slid toward the door, it would also allow for a bump out in the top section to allow for more space for a reverse loop, wider radius track, scenery, accessories, etc.
There is a slight reach issue on the right side of the big peninsula, for my money, in that space, I'd be ok sacrificing the reach there to gain a large area as shown below. Yard tracks/engine house, etc could be down by the door.
Just throwing some ideas out there...
Thanks.