You didnt think to sex it before putting time and money into growing it? Seems ass backwards to me? But then again you did plant both of them (and more seeds from what it sounds like) into, from what I can tell is a cast iron bath tub. I find myself doubting whether you studied cultivation at...
Please dont come to colorado with a half baked (pun fully intended) dream, our traffic is shit already. Its not the wild west, yes its legal but you cant be running hundreds of plants at once unless you have a commercial license. 6 plants is all you can have as a home grower (total of 12 for 2+...
Look into cattle panels on a raised wall like you are interested in. Theyre not quite as wide, but they are VERY sturdy and can me made an infinite length.
Assuming you make the transition carefully over the course of a few days or a week, hardening the plants off in a semi shaded, sheltered location they should be okay. If the day light hours match your inside light hours I dont see much of a problem.