I struggled with the motor mount for a while (meaning I replaced it and it came straight out again, then did it again so it didn't come out, and it delaminated the ply plate it was screwed to!)

The final install has aluminium brackets running through the nose plate, and screwed firmly to the motor mount bearers, and a 2mm carbon fibre plate in front ensuring nothing can move, along with additional screws and lots of focus on a good epoxy joint all round. You can see the changes in the photos below compared to the earlier one.

I also opened up the opening in the front of the cowl and put in a baffle to split an air stream to aim straight at the motor while leaving the balance to flow over the batteries and out (both through the bottom of the cowl, but also out through the fairing under the wing).