5 minute designs** (or there about 🙂 )
That sounds pretty cool. I'd love to see it when finished. I have personally always been a fan of small 2.1 builds.
I think I would try the smaller cap to begin with. I haven't used that tweeter, but I am willing to be you are going to get some audible distortion if you cross too low. It is impossible to say without really measuring it, but with a low order crossover, I think it might be wiser to try the higher crossover point first. Just a thought.