If you are new to RC planes, I wouldn't recommend scratch building an EDF because it might get a little frustrating, but if you are experienced then look on this site, it might have something you are looking for. (sry if you already started building it, just saw the post)
I can only endorse Ranger_107's comment.
Building any EDF is quite a challenge and a micro one even more so. Tricky to build, difficult to find the right components and even harder to get to fly. Of course it can be done with the right level of skill and experience.
Have you built and flown RC or perhaps a 'bigger' EDF?