nice start - but i really think you need to think about what you're making. as others have pointed out - it's missing some vital parts - i know you're still working on it, but this makes no sense at the moment - the pipe from the fan goes straight into the wooden plank...? and that fan looks like it's just going to tip it over.

you'll save yourself a lot of time and headache if you think through your project before you start making it. I remember a design project in school when i made a phone for the deaf and it was only when i handed it in that the teacher asked me how would they hear it ringing...or use the receiver....