grow box set-up questions

i'm going to develop a grow box 4'x2'x4' tall.i'll put 250W or 400W HPS and i'll try to perform SCRoG.i am not sure how to train the plants.should i cut them(i'm a little afraid to do this).what will happen if i do not use any fertilizers,only fresh ....CO2 and water(ph-6).there are nutriens and some kind'a shits in the soil mix(ph-6).i'll use room fan to circulate the air inside the box and two fans for intake and exhaust,maybe cooltube on the bulb if to much heat.so my question here is: will that setup be usefull??

1)I would not cut the plants if i where you. The best way to do it is to pull the tallest and fastest growing branches to the outer edges of the screen. Once they grow a few inches above the screen, pull them back down under. Do this until about 70% of the screen is filled and than you start to flower. This should get a full canopy of bud .
2) If you dont use any fertalizers than your plants prob wont be as full or healthy but im pretty sure you can get by without them.
Other than that you should be set. Good luck man. Keep us posted

ok i'll train them that way.10x man.
i'm gonn'a use power plant or skunk#1.is that OK for tha SCRoG?..or g force maybe?

the power plant is stress free and a very good choise for the first time grower like me ...i think