Its been done before, theres a certain name for the method but i cant remember what it was called. plain and simple thought, plants grow towards the light, wherever the lights are. screen with 2cm holes im guessing the plant could grow through that, its amazing what they can do. If you used a small mesh screen the plant would reach to the top then grow out.
I remember reading somewheres that the method was getting a bunch of female clones putting them in a box grow close together, then putting screen above them at like 2 feet maybe. The plants would grow to the top of screen, then spread out, eventually at harvest the plants would fill the box with lots of bud. hope that helps.