My Contender has a three piece construction, and the sides of the hull have outside glass, a thin ~1/4" core, which looks like divinycell, and a thin ~1/8" inner liner, which continues onto the sole. You can push on the liner and feel it give slightly.
When you bang on the outside of the hull, it feels a bit flexible, but below the deck line, it's rock solid.
Only two vertical supports to house the fuel lines and wiring, but there are a lot of stiffeners under the cap, which is cored with divinycell foam.
If it was my boat, I'd add some core to the sides, besides the 1708.
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