Sorry for my scepticism, but seems like you're underestimating the size of such project.

As for examples, you may look at Ubuntu Edge as failed crowdfunding.
You may also look for Pyra and Neo900, for costs and time that such project will require. (Please note, that both of the teams got enormous experience with development of such devices)

I'm not saying that it not worth trying, but probably you should present at least the concept and the financial plan for the project.