I believe they are capable of building many, many more of those type vessels in short order if they plan it out in advance and have the infrastructure in place to do so.
We are helping them establish that infrastructure.
Given what we know of their overall plans from documents that they themselves have produced, we must presume that they are preparing to carry out those plans ... the development of such infrastructure is a necessary comnponent of such plans.
And this is not to mention the many hundreds, potentilly thousands of commercial vessesl they would force into service in such an event.
I address all of this in my book series ... albeit from the fictional standpoint of the scenario presented in the story.