Those will work fine Buds just drill a few extra holes for drainage. Those roots will tend to wrap around that container the larger they get as you may know, they'll choke out the airflow in the medium, it's happened to me drill more holes. Elevate on risers try putting blocks in your water collectors for runoff but elevate them for sure. They like warm. Being larger pots you going to do photoperiod or autos (that's overkill container if so) most use 5gal fabric for autos anyhoo. Goodluck and let us know how your going to heat that large space and provide airflow. I would highly recommend the grow tutorials within this GWE site, they suggest many methods of soil to containers to grow medium to nutes all tried and tested by weed only growers. Environment for growing light heat vent. is #1 to prepare for, soil mix is very very important. Goodluck