Lose the Aluminum foil and think mylar instead.

As many lights as you can remove the heat from.

No, you will need to lightproof any hole you cut.

Get your roomates' permission. If they truly think 'just a few plants' is okay, then why do you have to hide it in the attic disguised as a computer box? A larger cabinet would be FAR easier.

Fiberglass insulation is not a fire hazard, but the amount of sawdust present in most attic crawlspaces IS.

It doesn't sound like you're in a really solid position to be growing indoors right now. Have you thought about an outdoor crop in spring?