FedEx Shipping Integration

I have my entire shop ready to go but we are stuck on the shipping. We are going to be using FedEx and there is no option for a shipping calculator for FedEx currently on Marketpress. I saw a thread from 7-8 months ago where they said it would hopefully be out in a few months but I guess it's still not finished.

I was wondering if there was another plugin out there that would work seamlessly with Marketpress OR if anyone know how to take integrate it if I have a FedEx developer Production Key. I assume it can't be that difficult and if anyone has done it then it should be as simple as changing account information, etc, no?

Any help would be greatly appreciated.