Currently I'm working on this nifty interface where you will be able to configure you cell types.(Wall, Door, Path, Water...) You may enter your cell type names as strings and choose a color for each type. The colors will be set automatically while the dungeon is being generated and will become obsolete if you decide to use textures, models or prefabs. For every cell type you define in this window, you will have the opportunity to assign a prefab, however that's not ready yet!
I'm working on this on my free time and enjoying learning extending Unity3D's Editor class. Hope to update you guys soon again!