I really like the manufactorum on page 27 of Cities of Death so I'm going to try to build one to use as a centerpiece.
As it is always hard to see the back of a building on a 2D photo (har har) I've started this project on the computer using Google Sketchup. This way I can make a basic plan for cutting my foamboard (it is exact to the millimeter and I have used 5mm and 3mm foamboard as my building blocks, the little perons at the front is scaled to Astartes height). Also it gives me a chance to consider if the building will work on the tabletop. I am still in doubt to be honest, it is rather high so climbing it during a battle will cost allmost the entire battle. On the other hand it will block line of sight and if succesful it will look great. It will also give me a chance to use a lot of pvc piping I have lying around after a major home renovation project. So there we go.