How does the gooseneck fasten to the mast, other boats had a snap in lock type.
Plywood bunks have any structural properties..
roamy,
Barring any previous owner changes, the gooseneck from that time period was a Dwyer Mast part (DH 4151), which slides into the 1/2" groove in the mast. It will slide down to the downhaul cleat until the halyard pulls the entire sail up (I'll see if I have a photo). The boom should have a casting that has a pin that will hold the clew and allows the roller furling mechanism to work (spring is inside the boom body). Salty19 has a recent photo of his vang that shows the set-up in another thread.
(https://www.dwyermast.com/images/dh418sm.jpg)
The bunks are supported by the outside hull and plywood frame that runs along the edge near the keel. Directly underneath the plywood is foam.
(http://i779.photobucket.com/albums/yy72/tmdrozd/Com%20Pac%20restoration/e98d7c5b.jpg)
If you do a search for Jordan's restoration, you'll see what a gutted CP-16 looks like. I think he used 5/8" plywood to rebuild the bunks from scratch. The full restoration that the above photo was taken from is here: http://s779.photobucket.com/albums/yy72/tmdrozd/Com%20Pac%20restoration/
-Justin