30 Story Tower - Mapping/Modeling/Processing with Phantom 4 RTK

I have a ~30 story building that a client has retained me to 3D model for their internal inspection purposes. 

Does anyone have input for my best mission planning and workflow to map this with our Phantom 4 RTK and process in Pix4d for best result?

Specifically, is there a function to fly a circular mission around the tower at different levels and camera angles? What about overlap, what should I target? 80%? 85%?

Flight area is clear and I won't have any overhead obstructions to worry about. 

We will also fly aerial (nadir) double grid mission with eBeeX and Aeria/Soda 3D cameras and process separately. 

Any input and advice for planning this mission is GREATLY appreciated. Many thanks in advance.

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