Why are you going over your line manager's head to request this?
^^^ This ^^^
There's a chain of command, you really want to speak to your manager first; as your don't really know what's happen or what they have in the works. IF your manager can't help you THEN ask them to setup a meeting with someone who can as that may not be the MD but the HR or People Development Team.
It's your managers job to to manage yours and the companies' work needs, if they refuse to help, that's when you have to consider going to their manager. Going straight to the MD is never a good idea and can be considered as overkill.
EDIT: The sad thing is that we all get paid to do a certain job, I love building electronics and I'm good at it. But currently my work place has no need for another member of staff with that skill set, so I do what I'm paid to do which is fix computers and servers.
I would just knuckle down, work hard at the job that your paid to do, offer your CAD skills if you think they are asking for it and keep an eye out for a position in that department or with another company.
Going to your MD about this is a no no, it will make you look bad no matter how it turns out.
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