Anyone have a good recommendation for a thin backing material for the base of my booth/dinette/couch/sleeper? I'm putting a "U" shaped booth in the front of my 67 Streamline Duchess. I've framed in some three curved radius along the base. My plan was to use 1/8" door skin material and then use a real quarter sawn oak veneer. The doorskin can handle the radius (~ 6") and I'm looking for alternatives that will be a good backing for my thin veneer material. Recommendations? Ideas?
Here you can see the basic shape outlined in masking tape. 
This is a drawing with measurements of what I've framed. Pics of framing below.
This shows the beginning of the frame and the black metal table legs. This is a cool design that swings down to sleeper height. It also is mobile and can go outside.
Here you can see the finished frame with 3 radius corners. Still trying to figure out the best way to support the table top. I've thought 1x2" oak in the straight aways but then am not sure what to do in the curves. Ideas?
Working on where to put the seams in the plywood & cushions. I want them to line up so its easier to access under seat storage. Thinking I'll permanently mount seat plywood in the corners and then leave the three other sections as access. 
In this section, I'm thinking one big piece of plywood/cushion. Not planning to put in a hinge, just a small lip to keep plywood in place and then velcro the cushion.
One last overall look at this phase.
