If you haven't already I'd suggest doing a search both here and on google to see if anyone has attempted it yet.
If you have searched and came up dry, it might help to look for gauntlet/forearm builds with the working/pop-up missile compartment. That may help spring some ideas.
The mini missiles can be static, and the doors could act as a reveal. But since it has 3 moving surfaces, unless you are an electronic wiz a functioning one may be difficult. It might help to make some rough mock up models and go from there. That would show you what will and won't work, plus possibly give others a starting point for suggestions for improvement.
Saying you want to make the whole thing gives us an idea of what you want, but without a more specific plan or scenario we don't fully know what you want.
Some examples:
- is this going into an existing suit?
(-if not, you might want to start there.)
- how much function is wanted?
(- this'll show how much skill/work is necessary)
- electrical or mechanical functionality?
(- what skill(s) and advice are needed)
Best of luck with your build :thumbsup