So, you have to write a feasibility study! Don't panic, and for goodness' sake don't Google it, or you'll end up thinking you need a degree in statistics before you begin. It's as straightforward a task as they come.
I've written a short six-step guide to doing a feasibility study. Download it here! If it's useful, feel free to circulate it.
If I can improve it, please tell me how. If I can get it to a point where it's really helpful, I'll turn it into a proper e-book, and I'll follow it up with another on how to do a business case, which is a feasibility study's older, bigger sister.