only the original wood can build boat ,the added wood can not make to boat
minecraft 1.12.2

I attempted to create a boat using Natura Eucalyptus planks, but there was no output on the crafting grid. (Note: I was using the Tinker's Construct crafting table.)

Although I wasn't expected a Natura Eucalyptus boat (though that would be nice) I did not even see the vanilla boat.

...that's because of the boat recipes are not ore dictionary'd...because they're wood specific, just add an oredict'd recipe yourself.