Amazing Spider-Man #638, Page 12. 2009. Ink on Marvel board, 11 × 17.25″.
When faced with a complex scene, I often find it helpful to draw a crude plan of the setting from above, complete with notes and directions for the major players. In this case, I had to match a scene from Amazing Spider-Man Annual #21, in which Electro and his gang have just been caught by the police.
To be completely honest (with myself), I probably didn't need this level of accuracy since it's doubtful that anyone would take the time to compare the sequences (even when featured on a blog). Nevertheless, I not only drew the plan, but curated a 3D scene in Sketchup using existing models.
While not all the details from the issue matched up exactly, I did my best to arrange them in a similar manner. Joe Quesada provided me with the buildings, which he commissioned Jason Christiansen to build, along with many other models for Marvel. You can see the model used from a different angle in a previous WRW, No. 164.