only one light per closet, your 1000 watt hps lights give out about 145,000 lumens each and you do not want to exceed 10,000 lumens per square foot for flowering, and you only need 2,000 lumens per square foot for vegging. so you don't really have a need for the second 1000 watt light unless you want two flowering areas and you use the 2x8 space as your second flowering area. if you do that, then yes, you could use your rubbermaid containers and fluorescents for vegging/mother plants. you probably will need something stronger than a computer fan to cool the rubbermaids, given the cubic footage, but try it first, you may be ok.
and yes, you can make a ventilation line: carbon filter at ceiling->fan->cooltub->exhaust. that may or may not be enough exhaust for the room, depending on what ambient temps you're dealing with. only way to know for sure is to try it and add more ventilation or a/c as required to keep your temps in the 70's f.
if you have access to an area of relatively cool air i would add a fan to your inlet. if not, then passive hole and/or just letting air seep in due to negative pressure is ok.