Making of The Hole
9. Apply these parameters to the spline to obtain tubular:

10. Scale out these splines to make it out of the greeble and obtain this:

11. Now you can create other buildings like this:

12. Deactivate the modifier and go back to editable Poly => polygon level. Select these polys and detach them as clone "scatter_base":

13. Select the building done in 11. and select scatter in Compound Object.

14. Set these parameters in scatter:

By playing with all those stuff you reach these kind of modeling:
















