...so I'm presuming this is N scale?
If you're interested, I'm trying to hash out a walk-in style plan for expanding my N scale K&I RR.
You'll find it in the Track Planning For The Future forum. The thread is titled Another K&I Expansion Plan.
The drawings are kinda primitive, 'cause I don't have any cool track planning software...I'm still operating in the stone age with ruler, compass, & graph paper.
But take a look anyway, it might give you an idea, or two.