RE: Mount a cowl with magnets?
No drawing ability but start to visualize this:
4 pieces of 1/4" diameter carbon fiber tube or rod, securely mounted every 90 degrees to the cowl.
They stick out the back 2" and will slide into 1/4" holes drilled in airframe.
This should support the vertical and horizontal movement of the cowl.
Then add several rare earth magnets on the fuselage with small steel plates in the cowl.
Or use mating magnets, whatever.
This should keep the cowl from moving forward.
Since when have you seen a cowl move forward anyway?
Maybe on a less-than-perfect landing but that's all.