If it was someone I knew well and trusted I would supply a copy of my drawing on paper. Absolutely no way on handing out the CAD file. If I've never heard of them, the answer is a very clear, "NO".
What I'd like to do........
Tell him you will provide him a with a coordinate file and that he can connect the dots. Then give him some old coordinate file you have no need for.
What I'd most likely do.......
On a side note to this topic, what would one do if at proposal stage, the client specifies that the CAD file is to be included in the deliverables?
Have lived that exact same scene
One would assume he knew what your answer would be. It never hurts to ask, and you never know for sure until you do.