At this time, there is not a VMware Validated Design specific to service providers and the use of VMware vCloud Director.
However, I can suggest reviewing the Certified Reference Design for VMware Service Providers that was published in October 2017.- -
Staff II Solutions Architect, VMware R&D
VCIX6.5-DCV, VCIX6-NV, VCAP7/6-CMA, vExpert '13-'19
Ryan, there is a newer version available from July 2018 (Version 2.5):
In general, the complete vCAT-SP is absolutely recommendable: