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-Firstly, it's very easy to finish such a shallow area. Which is great for me, as I can't always spare the time I'd like on the layout. And if there is one thing I've learned in this hobby, it's that motivation is fueled by what ever was just previously completed. Once I finish a scene and I'm satisfied, I simply want to see more.
-If I screw something up; either some new scenery technique I tried or a new track configuration comes to mind, I'm not hesitant to rip it up and start over.
-Since it is only a foot and a half, I tend to spend more time detailing these areas since it doesn't seem so daunting to finish it. Working on an 18" deep layout is a lot like working on a diorama; I think the mindset is somewhat similar. I think if I was building a layout four times as large, I could see myself taking some short cuts I would have otherwise not.
-Lastly, I like challenges, especially the design and planning kind. This definitely qualifies. Fitting all the features, structures and scenery on your wish list takes some thought, which is half the fun for me.
So, on to the next scene.