The box is good for vegging in. But not enough space as they get larger.
I have no issues flowering in this system , but I also have a double scrogg table above it… 
Do your roots have enough room for the plant to fully mature? How did it not affect growth?
What kind of cannabis is it?
I’ve been growing with ebb and flow for about four years now. I can say this is a system that needs to be watched closely. I grow big plants instead of small ones in a scrog style. I must remove the bottom pots after being in flower for about three weeks due to the roots growing into the feeding tubes. I put in some plastic hose barbs so I can change them easily with clean ready to go pots. If a pump fails you better catch in within 24 hrs. or you’ll stress the heck out of her. This is not a system you want to have running for a week while you’re on vacation. I’m not saying it wouldn’t work as long as a pump or something doesn’t fail. These little pumps have small magnetic motors and sometimes they may need a slight tap to get them working again. This is rare but something I’d have happen if I went on vacation. I take reading twice a day and make sure all pumps work while taking the test. I’m retired but if I wasn’t I’d be growing in soil.
Here’s three that I was just changing after three weeks in flower.
Here’s three in my 5X10 room.
With close monitoring this system gives great results.
Where can I get a system like this
I will tag you into my journal. The system that I designed, seems to be working rather well and it’s a fairly easy build 
can I get a list of what I need and how to build this system. I have been scrogging in soil and this would be so much easier
Let me know if you have any questions or if you think it might interest you. If I can build it, so can you.
Good luck! 
Also see this thread, Opinions About This Setup From PA Hydroponics - #34 by Jungle.