just watched the video..
1. not bad music but could be better
2. the one real recommendation i can make is if you loose the tube lights you might be able to get the MH and HPS a little closer. with that much output on the HID's the tube light kind of gets pushed to the back.(not much results for that amout of space its taking up). thats just my two cents.
3. as for the blower: i dont really have experience with those or mounting them but i know you need airflow for your plants. you grow space looked good, you just need and get airflow in and out. are you willing to cut holes in your closet space doors?