fishmanlee said:
would be kinda hard because its basicly part of the bens hut scene or the lightsaber construction cave if you will

I don't know if you have been following any of the various takes on the fan-o-matic style restructurings but the basic idea is that Luke went back to Dagobah and completed his training with Yoda and his first scene is Yoda's death (some versions have him at the beginning but most still start with Vader) later we see Luke land on Tatooine and his conversation with Ben takes place either in his hut or outside (seeing as it would almost impossible to film the sabre construction scene it's implied to take place before or after this scene).

The droids set out the next morning.

There aren't many places where you could put Vader contacting Luke into the Death Star scenes so the ideal place would be before he arrives at the station (which explains my suggestion).

If the film was cut along the lines of the theatrical cut it could be put as Tydirium approaches the Executor.