Thanks for the diagram. I believe I am going to end up having one VPC per chassis and multi-homing each blade to both N7K's. Prior to this design, I had separate physical interfaces (and VPCs) for internal and external traffic. I am now contemplating consolidating these into the same physical interfaces and VPCs which will free up the additional 10GB interfaces on the N7K's that I need for multihoming each blade.
Each connected interface on the chassis will be a member of the same trunk. Aggregate bandwidth available to the trunk will of course be determined by the number of physical interfaces spanning the blades of the entire chassis (2 blades = 40Gbps, etc).
This will provide switch redundancy for even the LTM instances that only span one blade since each blade will be connected to both N7K's.