room and set up

15 ladies with a 600w hps cooltube. I understand how to build/vent and all that, but dont know what size box to build? Im also contemplating doing a homemade ebb and flow set up for a couple of the better ones (6)and would like to know what size growing try to use?

right now I am growing four Sour Diesel girls and two Kush plants in a 2x4 ebb and flow tray using a 600W HPS light. It is a little crowded but I am showing excellent results. If you are only going to have access to the one 600W light , this might be your limit on plants unless you are planning to a bunch of small ones. I'm also using a 4x4 closet that leaves me a little room so can tend to the girls.
I have the 2x4 table, built a stand out of PVC, made a resivoir out of a rubbermade bucket ( 18 gal. ) and got some pumps, tubbing, timers, etc.
Here is a pic of my girls after 14 days flower.

thanks a bunch man any pics of the set up ide like to grab some hints on drainage ?

I don't have any pics of my system but it is very easy to build. It just sounds intimidating. BING " how to build an ebb and Flo system " and look at all the info and look at the " you tube " video clips you can find.
Not counting the lights, you can build a decent system for under a hundred dollars that you can customize.
also, check CRAIGSLIST, under FARM and GARDEN and sometimes you can find a used system for a steal.