You can make them touch. Using your Osnaps or your new to 2012 3D Object Snaps, there is no guesswork involved.
There are lots of different ways to do SECTIONS, try your Autocad HELP (f1).
You might like to try using 4 viewports in your modelspace, which enables you to simultaneously track objects from different perspectives.
In your modelspace (on 2012) click the icon in the upper left corner, then choose VIEWPORT CONFIGURATION list, FOUR:EQUAL.