Yes I've seen some examples of what you're trying to do, created in LCS. There used to be some quirks about "drawing" the layout with certain radii of track. But the iPad view just has to be representational, like a schematic. It doesn't have to be exact.
Some other options might be C-MRI and JMRI. I don't know much about them, other than they exist, and are mainly used by the advanced DCC crowd. Supposedly DCC is not a requirement to use JMRI layout control, but you'll have to do more research on your own.
Perhaps if MTH didn't sic their legal eagles on the folks who tried to interface DCS with a computer (as it was designed to do) years ago, we would have already had a DCS layout control app from a third party. At this point, I wouldn't hold my breath waiting for MTH to come out with it on their own. My $.02.
