I'm not a kush grower but yer plants look good dude :greenthumb:Are you gonna let the male mature to collect pollen ??
Nearly impossible to estimate yeild, so many factors contribute to this....i.e. how much light power....what you feed them, etc. I noticed there is no reflecting film in yer box, that is 1 must-have so that lower branches get some light reflected on to them. Apart from that, it's looking good. :greenthumb:
:hippy:
Slayer