In boat building there is always a balance between the amount of framing and the thickness of the skin. More framing = thinner skin, less framing = thicker skin. I usually build as light as I can within strength guidelines. That said, I wouldn’t want to run into your table with my boat ……. I might not win the day. Two layers of 1/8 pw laminated in a curve like this will be very strong all by itself. I’m just guessing really but I think maybe five ribs would have been fine.
Hammer veneering with thin veneer on a big curve like that should be no harder than on flat. I did a practice piece once to see how hammer veneering on a curve would work. It was actually really easy and I had about as much experience then as you have now …. and a home made hammer. :-)
How were you planning to clamp the 1/8" pw to the frame?
The early bird gets the worm but its the second mouse that gets the cheese.