Ask HN: Can open source books be crowdfunded

I'm teaching a hands-on programming course for kids aged 11 to 15 this spring. The course itself will be held over 7 lessons with 3-week intervals. The idea is to teach kids to program in JavaScript using the awesome Raspberry Pi mini-computer to build a remote controlled vehicle. The kids will build, program and configure the vehicle themselves (in groups).

In the end the contents will be brought together and published as a free and open sourced book.

I have created a crowdfunding campaign for this project, but there is currently not that many backers. What can I improve to reach the funding goal, and is it realistic to reach the funding goal based on crowdfunding alone?

Link to the crowdfunding campaign: http://www.indiegogo.com/projects/open-source-programming-book-for-kids/x/5687072