I think you would find it very expensive. You might contact the company that made the movie models for Das Boot, that would give you an idea of the fraction of the costs of re-manufacturing a working Type VII.

I would imagine that to re-manufacture, using the same materials and designs, would cost several hundred million dollars.

I doubt that a contemporary ship building company would be able to re-manufacture a 70 year old submarine. I think the best you could do is get a current design that can look like (model) what a Type VII would look like.

There may even be maritime regulations that would prohibit an exact re-manufacturing due to safety or environmental concerns.

It would be pretty cool though.