Heres how I did mine, theres just an aluminum rod thats epoxied into the nose of the hull, with two 1/4" round neodynamium magnets also epoxied into the hull on each side, flush with the surface.
Then the cowling has the same two magnets, flanking an aluminum tube that slides over the rod thats epoxied in the hull for alignment, and the magnets obviously hold it all down
and the 1st pic was before I added magnets to the cowling, sorry I dont have any current pics of the cockpit.
I actually ended up cutting that rod in half so it didnt protrude so much, and the magnets were painted over so you cant even see them now.
Phil actually included a small piece of 90 degree angled aluminum for attaching your cowl at the front, what he usually does is simply bolt it down where I have my rod, and then he drills a hole in it so that a nut a bolt can be attached to it. Basically he has the bolt pointed toward the front of the boat, and then just adds ply to the inside of his cockpit, and drills a hole for the screw to slide into. Since his screw is horizontal, rather than vertical like mine, he can simply have the cowling only "held" down in the back and its still not going to come off, whereas since my rod is vertical, it still needs to have something to hold it down there.
hope this helps! I can post pics of phils setups if you need.