This is a question for NorthernCreed i think. He is the master of bushcapades - beside Mr. Bush of course. What you could try out is to start with the free bird nest from DAZ - this may give you a good start with those nestled branches that you may need. For the rest i would say, a lot of Botanica work with trees that don't wear leaves anymore.

One day your ship comes in - but you're at the airport.