It'll be pretty cool. Plan for the spider plant to grow the hell out of that container in a matter of weeks - they're fast, they're runners, and they don't like to be contained. I used to have a hanging one that draped about 5' and weighed maybe 30 lbs. Tillandsias don't really like living with anything else. I'm not surprised it's mad. They grow where nothing else does, so if everything else is happy, it's by definition a hostile environment for tillandsia. A suggestion? plant a terrarium with the intention to see how cool it will look in six weeks, in six months, a year. Somewhere I've got a picture of the one I built inside this awesome '60s bubble terrarium. It was like this one: except I ditched the stand and hung it from a leather webwork I built. Looked dope. But it didn't really hit its stride until the plants had a chance to settle in and grow together.