Ish i like to grow nice and simple so i find the best way to make a little set up as i like to call it or grow chamber ,would b more corect.
All you need is to go to your local alluminium dealer and get the square tubing that fits together with special plastic fittings so u can build a square fame.U will need 4 uprite post the same length as hiegh as u need and 8 equle lengths to make it into a square ,4 at the top and 4 at the bottom so the legs dont pull in.
then u go to your hardware store and buy some ply wood sheet that will fit over the top of the frame u have built. cut a hole for the exhaust fan screw that in.Cut a hole in the midle so you can hang your light.
u then need to go to your local hydroponic store and purchase that plastic that is black on one side and white on the other.wrap your frame in this ,white side in.I use a good quality tape to hold it all together.
Then u need to make a door buy cutting down to of your upright post atach velcro to the plastic then u can fold one side up and down...
i have grown many a crop like this,haveing the vacume fan on top,leave a little gap at the bottom of the grow chamber.this gives u great air flow.no need far a fan then...hope u can follow my ramble