How do I make a scheduled trigger dependent on another build's success?

I've got my build broken up as follows:

Build SMARTWeb - VCS Trigger

Test SMARTWeb - Dependencies Trigger (Triggered by Build SMARTWeb)

Deploy SMARTWeb - Scheduled Trigger (Every night at 5:30pm)

...with each one being a distinct build configuration.  I'm making this up as I go along, but my thinking was that I could get the Test and Deploy configurations to only trigger if the Build step finished successfully.

Yesterday, I checked something into the build that broke it, which I expected.  I went home (like all the guys that break the build), and at 5:30pm it Deployed that broken build to production.  I naively thought that somehow the scheduled trigger wouldn't run since the Build SMARTWeb build had failed.  I see now that that was my mistake.  So, what am I missing to have the Deploy configuration be a scheduled build that is dependant on the Build SMARTWeb configuration building successfully?

Oh - I don't want to put my deploy script into the building of the SMARTWeb configuration because we check into the VCS in the middle of the day and I don't want it getting published to production in the middle of the day.  Only at night.

-Nick