Convert 2D floorplan to 3D model

Hi, i'm trying to convert a 2D floorplan into a 3D model and wasn't sure what the best way of doing this. I'm more looking into something similar to this: www.cse.cuhk.edu.hk/~shor/graphics/flat.pdf Basically reconstructing a 3D floorplan from a 2D blueprint while using minimal human intervention. It might be a bit complex to build such an application, however, i'm just looking for ideas on how to do it before i delve into writing the code. Please let me know if you have any suggestions, your feedback is greatly appreciated. Ahmed