Layout Based on DER Gerbers

Once I have the design I'm happy with in PI Expert, what is the easiest way to produce a good layout? Please tell me if the following would be a good approach:
- DER-218 is similar to my requirements (DER-218 is 100W 12V 8A and 8V 0.4A free convection 40 deg C with TOP260EN; I need 118W 18.4V 6.4A in an adaptor without air flow)
- In PI Expert I had an optimized and passing design with "adaptor" selected (not "open frame") and 85C amb, but it used transformer core EE35 and TOP261EN.
- I forced it to use the same transformer core as DER-218 (EE40), and kept U1 as TOP261EN. I also changed the pin assignments to match up with DER-218. Design still passes, but not optimized.
- Can I now use the DER-218 gerbers as a head start to the layout?
- If so, is it worth actually importing the DER-218 gerbers into Altium, or should I just use them for reference and do the layout from scratch?

Thanks