IMO the Rhino bed liner isnt such a bad idea.
If you just used it as an inside coating it performs several functions. Provides a low slip surface. Protects the wood surface from sun and moisture, as well as abrasion. Would likely stick to wood quite well, probably holding pieces of the wood together even if the wood split or pieces of wood seperated because of a failed glue joint.
The most important function would be that barring a really really bad "crash" with your boat, your boat is going to remain intact enough to float. That Rhino stuff is amazingly tough, flexible and stretchable.
It would be interesting to make a test panel then try shoving large pointy rocks,sticks,logs through it and seeing if the liner is punctured or just stretched but remains intact. I'd bet the latter. Like someone said, the military considers it low level armour.
Now, whether the cost or weight penalty is worth that I don't know and YMMV. I suspect that it is at least possible that you could build a sorta light wood boat and coat the inside with Rhino liner and end up with a more unsinkable boat that was still lighter than if you tried to achieve the same thing by just using thicker wood.