RTC and Planview integration

Did someone work on Planview and RTC integration. I have few concerns regarding this.

i) Which method should we use for integration? The requirement is as follows:
     a) We want to import the work items from PlanView to RTC and vice versa.
     b) We need to update the built-in attributes as well as customized attributes, but some built-in attributes are  
          read only attributes in RTC.
     c) We want to update the status of workitems from Planview to RTC and vice versa.
     d) We need to import Plan/iterations from Planview to RTC.

I would really appreciate your feedback.

Thanks & Regards,
Tariq Ashraf