Could you post some additional photos of the neck/fingerboard joint? I'm not seeing it clearly...
As far as the rib laminate goes.... get 3 or 4 "Quick-Grips" clamps. Many different manufacturers make them; they look like this:
http://www.rjrcooltools.com/shop_ite...m?subcat_ID=23
(This is the best I can do for posting pics.... sorry)
Anyway, you need Quick-Grips that are large enough to span the width of the rib (8"). Secure the clamp to the rib structure, with the pads touching the back and belly of the bass. Now, using little wedges of wood, fit them under the Quick-Grip bar... between the bar and the rib. This will apply pressure to the neccessary area. You should use some wax paper or thin plexiglass between the wedges and the ribs. I would use hide glue for this. There will probably be some "squeeze-out"... let it dry, then clean it up later with warm water and a damp rag.
g/l.