VW up estate

Here i am trying to extend the back end of the VW up to create an estate version. And I've incorporated one of my face lift ideas on the front and rear of the car. Here I'm just trying to find the best shape to extend the car. And I feel this still feels very VW and you can still tell its a derivative of an up. I've put the rear window line from the 3 door up and Incorporated it into this design as I much prefer it compared to the boring flat line which the 5 door up has.