As you have stated a carbon filter will be most important, and giving yourself enough space for the future. I ran into that problem, plants do grow big and that is easily over looked. If you live in a studio consider growing close to a window and venting out of there.
-Do research on your building. Does maintenance or anyone else come in unexpected?
-Do you live on ground floor?
-What kind of neighbors do you have?
-Whats the land lord like does he like to stop by and see how things are going? Yes that shit has happened before!

Use your head when building your grow box.
-Does it look obvious that something weird is going on?
Out of place wooden box in corner of room with cables running into it?
-Are cables running into a closet for no reason? Hide that shit.
-Glowing cab. at night? Seal that shit.
-Noisy fan? Find a quiet solution.

You get the point, if it looks obvious then it is obvious.

Hope this helped. Best of luck and smart growing.

--------------------------------------------------------------------------------------
Anything i write about here is purely fictional, i am taking part in an on line Role Playing Game (RPG) about the cultivation of marijuana. In no way do i condone the cultivation, use, distribution, or consumption of the plant with genus "Cannabis" followed by species "Indica" or "Sativa" or any other breed or hybrid of said genus.