$orgVdc = $orgED.CreateVdc($adminVdc) returns Exception calling "CreateVdc" with "1" argument(s): "HTTP method not allowed" with the suggestion to use CreateVdcsparam (CreateVdcParams) instead.
Appears it would need to use the createVdcParams object for parameters rather than adminVdc.
createVdcParams does not have a StorageCapacity reference object.