The slot was cut out fully at lunch time, and the brace them smothered in Gorilla Glue, and pushed in. No doubt when I get home, this is going to be a rather foamy mess, but at least it would have bonded!
Here is the tray in the nose. I have a bit of a repair to do on the old side walls, but this is all dry now and pretty solid. Just some hardware to add now for tying the battery and ballast to the airframe, then it's ready for paint.