man i think a little more effort can fix that mylar up nice i mean im not saying mines perfect but man bro are you trying to make hot spots? with that type of mylar hot spots are created easy since its non dimpled i prefer dimpled mylar a little more expensive but worth it as the dimples prevent hot spots. i havent tryed panda film yet but planning on it as its cheaper then contractors tarp from home depot. dont take offense of this but i would scrap it carfully so you still have all the stuff and make a basic blue print something to follow, believe me planning ahead helps out a bunch. also with them closet doors you will have a hard time moving air when theyre closed and telling by the bed you want it to be stealth, so you might have to cut a couple duct vent holes if you want to be able to keep the closet closed, or leave it open. also i only read something about geting 1 inline fan i "high"ly reccommend getting 750 cfm for outtake or bigger, and 500 cfm for intake. im saying this from expeirence i have a 600 watt in a closet with bigger cubic feet then yours and have direct ac duct hook up for intake, and 500 cfm for outtake i run the outtake all day but it still took a week or two to get my temps to where i want them and to stay theyre all day and drop 5 to 10 degrees at night. but anyways once you get everything how you want it youll love your new 600hps just do your self, and plants a favor and PLAN PLAN PLAN. your still waiting on someother stuff to arrive etc right?, so use all the extra time you have to makeing your grow closet as pro as possible and search the gallery pics and internet for ideas for you closet. i made the mistake of not planning for my cfl flower box before my hps, well anyways long story short with all my planning for my current hps flower closet i still had to change it around 5 or 6 times since i built it and just kept trying ideas till they worked and i got everything to where i want it.