Need advice/help on creating curved recess on square edge

Hi everyone. I fit and install stoves, fireplaces and flue systems. What i self learnt from pages and videos so far, im no means professional on this.
Im trying to add a stove/logburner to my collection. The problem im having is getting the inner door shape. it has a curved edge that goes into the door meeting the square glass…i need the shape to follow with glass but can not get it to work. Any help advice is appreciated.

Woodtech5W.skp (114.5 KB)

With Split Tools plugin


Thank you so much! Never even gone into using extensions before, but with great added tutorial ive done it.
Thanks again :+1: :+1: