Um, dude, what are you using as a medium? Mud?:wtf:
Really though, where's the dirt from/what's in it?

Noble idea for this microgrow, however! You could minimize stretching by using daylight bulbs instead. If not, the stretch would be beneficial to LST. Remember, any training at all (LST, ScROG, FIM/top/) will increase total growth time. If you're going 12/12 from start I'd steer clear from FIMing, and keep LST to a minimum. Should stay pretty short though if you are 12/12 from seed...