Get the Imperial Assault Campaign module for Vassal from http://www.vassalengine.org/wiki/Module:Star_Wars:_Imperial_Assault
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The imperial figure does not need to be in an interior space, only the Bombarded space must be an interior space and in line of sight.
If the rebels stand on an interior space, line of sight can usually be drawn into that space.
If the rebels stand on an exterior space in front of the interior spaces, they block line of sight.
I would consider targeting the space to be analogous to targeting a figure or object (other than door) in that space.
If a figure is in the same space as the token, the figure and token are targeted for attacks independently. Neither the figure nor the token block line of sight to the other.