DIY Ribbon Tweeter build question....

Hi All,
I just picked up a pair of Aurum Cantus G2Si Ribbon Tweeters for a song and was wondering if adding them to my system in conjunction to my Fostex driver'd speakers and 25w/ch tube system would be advisable?

I don't plan on modifying the Omega speakers, but I have the skills to build a nice encasement for these.

If you think it's a good idea, what do I need as far as capacitor / crossover?

Thanks,
K