I have worked extensively on technical animations, for the European Agency Agency and several other customers. I can help you visualize the presentation through a hand-drawn storyboard before approval, deliver realistic animations, and complete the video with 2d graphics (text, logos etc) and music.
You can see several animations on this type on our website www.animonautes.com.
NB: I just subscribed on freelancer.com which explains my empty reputation field.