May be its too late to respond, but i think i can flash some light on this view about CAD designing. If you are a chemical engineer, computer aided design which is mainly concerned with mechanical stuff can be helpful in design equipment and piping works. where few advanced process industries will be recruit them for example a Schlumberger service company ask for a cad designer(mechanical engineers).

But if you can learn and master matlab and aspen plus software, they help you lot. As you can get option as process engineer even if your a girl. so that you can simulate and optimize the process parameter for efficient and safe plant operation.

hope i could reach you with few.