Hi
I understood what is your need.
I am a 3D generalist, I have a good experience in modelling, animation, rigging, effects, and post.
Honestly saying that I did the same type of project for the studio in the past. But right now I don't have those thinks to show.
You need good quality for that so you have to choose a good freelancer for that.
For the demo I need 2 to 5 days to show you look and feel of final output.
I am new on this site, but you can check my profile
I Am inviting you to discuss further details.