Hi Mr. Turnip,
I don't know of an easy way to copy+paste schema elements, which is unfortunate. You might try to use a repeating section instead, even if you have to stretch the nodes a little. Regardless, you're data source should be THAT big - you might also want to consider splitting to a new form.
Matt Faus / Microsoft InfoPath MVPQdabra® Software / Streamline data gathering to turn process into knowledge