Howdy!  I'm building my first boat and so far everything has been moving right along with the help of a few friends.

 I'm having trouble fitting my aft bulkhead.  The side panels seem flush but the bottom panels seem like they are sagging.

If I trim the bulkhead to lower it won't that mean it won't sit flush again the sheer clamps?  Also this is my first post so I hope the pictures worked...

 Thanks!