New grow area help!!!???

Switching rooms and getting one with decent sized closet, but in worried on ventilation...
any ideas? I CAN NOT DRILL HOLES IN WALLS, going to Home Depot or menards and build removable door ( sliding door) i cannot make permanent fixture in my resident, but make medium retractable house in here, so i can mock vent, cut hole on pulling air down in, two small fans in side to help circulate and one facing base of plants, and another vent rite upfront pushing air out (DIY carbon filter)
but wut i REALLY NEED HELP WITH IS..
still CFL at moment
but meeting lady to look at 150 watt HPS for $35 tommorow, i mean hey! Only 35 need to go ahead plus 150w HPS and 1-200 (ACTUAL) watt 2700k cfl have to be descent results.

but will the 150w HPS be too hot to house in this small enviroment? Not sure on measurements yet, will tommorow,, no more than 2Ft. L/ 3.5-4ft. W

HELP ME RIU!!!.......... AGAIN!! Lol

It's 4ftL/4ftw exactly!But there's steps on back half... Thinking something nice now lol.. Only want 2-3 at once flowering

"2-3 flowering at once" listen man you'd be lucky to fit 3 guys in there alone and under a 150 ud be pushing it, get the 150 for sure itll help as supplmental lighting when you upgrade to a 400-600 which honestly should be done if you can Id go grow tent your guna have to run 2 gallon pots at max but i say fuck it drop 12 seeds in 1 gallon and SOG it just my 2 cents. for heat honestly get a fan and hang it up side down by zipties or rope i have a fans on every light there like 13 bucks per fan and you dont need tubing or to get ripped off on a brand squirrel cage fan

Thanks bro, been DOING ALOT of thinking