Its really up to you man if you are growing inside it really depends on the amount of grow space you have. They will grow 2 maybe even 3 times their initial veg size during flowering..
Btw in your first picture is that also the place you plan to go 12/12? I am just wondering because you will need absolute darkness for 12 hours in the flowering cycle. I am sure you know this already.
Not to mention you're gonna have a heck of a time with odor control if odor is an issue.