IMO, having growing in a PC box, And then t5's, i would not use a PC box every again except for clones. flowing in it is a waste of time, its fun for a little experiment but if our are trying to get something to smoke for at least a little while, its pointless, I pulled 8 grams from mine. thats like a gram a week for flowing.
I would highly recommend you do more research first of all.
Growing outside and inside are alot different. Heat is most likely gonna be a problem inside.
You need research tho, No one is gonna take hours out of their day to help one person who isn't willing to take the time to help themjself. I did months if not years of research on the net before i even attempted a grow, Since then i've had very few questions about most things, Im no expert and don't claim to be but i do know my shit about my setup and strains, and if i switched up setup or strains i'd have a new learning curve and no doubt have alot of issues at first. Its trial and error and hard work that make a grow, Not starting from square one with 100's of different opinions on lights, vent, nutes, soil/ hydro, List goes on.
Look at other peoples grow, find one with the same dimensions as your. Read them, You'll learn alot, Find one setup you really like and try to make it. Not hard just requires effort, which most people lack for some reason. Go figure.
Imagine trying to grow inside before the net and not knowing or having a thing except maybe a book. That'd be shit, I love the net!