It's completely doable. I don't understand why people don't put amps and stuff in their boxes. (well, that's a lie... amps is too much, but batteries work.) As for power exchange between the box... talk to Wasted_Ink and get one of his hardcore terminals, and ask him if he can do a bigger bolt, and ask for a Copper one.That way, you can basically have a terminal out, and terminal in... and if you do decide to get the terminals from Wasted, get ones for your subs, too.
And I can't believe you're afraid of people laughing at you. Is it such a bad thing you're putting your battery in your box? As long as you make sure it's the same net.cuft and the tuning isn't changed, you're fine. Stop being a baby.