Sketch / Drawing

I have a form that quotes pricing. I have an automation set up that sends approved or sold quotes over to an order sheet/table. We also need to have a sketch of that sent over along with the order details (all of which is already coming over from the quote form). 

What I am trying to see if its possible to do is have the user sketch out a 2D drawing of it similar to this- It doesnt even necessarily have to be this detailed:
What I have thought of so far is to have a file attachment where they can manually sketch it up and scan it- or use another software to save a file to their computer and attach it. It would be better yet if there was something to sketch in a large box basic dimensions/shapes. 

------------------------------
Mike Klausing
------------------------------