Curvy corner help

 From:  ActiveRendering (DJBLUEPRINT)
8759.1 
Hi,
I need a little help. I try to build a tablet with bevelled AND curvy corners like you can see on the attached images. I also atached my file so far. I did the seide profile and extruded it but dunno how to get the curvy corners now. I also tried to use loft but without success. May someone push me to the right direction?

Thanks
Sascha
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