I've created this for myself to help me mount the Ikea Bagganäs door handles (320mm) in an easy and consistent way on our new dressing cabinets. It might be helpful for other people, so decided to upload the design.

The distance from the edge of the door to the holes is 3cm.

It's designed in 3 pieces to easely fit any build plate. Use glue when assembling.

Supports necessary for the notches.