I saw one last Saturday, as just arrived, complete with slightly hollowed bottom. It felt hollow although the owner said it was "flattened for planing". There is print-through of the 1/2 inch cubes of foam under the deck, which is an interesting textural element. Ditto underneath in places, so the bottom is not exactly faired flat.
Also I looked underneath, and it looked slightly vee-d rather than hollow.
Note the curious use of English here, COPIED exactly from the Nacra A2/A3 advertisement:

You may also purchased your NACRA A3 thru a participating dealer:

Shipping maybe cheaper, when ship with other boats.
Safer shipping if the dealer receives boats per container.
Dealers have more experience with accepting freight thru common carrier
Advice on assembly or contract to assemble

I then wondered aloud--- "Hmmm---From which part of the world did the person who wrote this come?" Also, "Is that where they were made too?????"