Lighting an Interior Early Dawn Scene

[Austin Warren]

I'm looking for advice on shooting a conversation scene that takes place in the early dawn hours, when the sun is still behind the horizon and the exterior has a bluish look to it. The room it will be shot in has windows, so my initial thought was to put curtains on the windows to obscure the outside and then tent them from the outside. Inside the tent would be a daylight balanced soft box to make the curtain windows glow just enough to suggest that particular bluish light of dawn. The camera white balance would be set at around 3200. 

Is this a feasible and realistic lighting design, or are there other low budget techniques that would look better?

[Phil Rhodes]

Sounds reasonable. Depends what sort of time of day you might end up shooting. If you have the resources to fully tent the windows, great.