Forgive my ignorance, but I am missing why the stop tail would be roller bridge of the Harm VI...?
I think a Bigsby or some kind of trapeze vibrato would look cool with that...I don't really care for the natural finish though (ask my wife, I just stained a kitchen table and coffee table that we got for free because the natural finish didn't match our cabinets...made it a nice deep cherry). I also don't think the Rick-burst looks good as a six string bass...I'm thinking that the Harm VI needs stains like some of the Intrepids.
I really hope that Kurt sells the Agile VIs...I'd really like to see how this line gets developed further (personally I'd like to see it go to the custom shop and let people add/substract features and colors to satisfy their GAS...I know I would...because I really need 3 six string basses...).
It's probably not a roller bridge, being that there is no vibrato tailpice... But with an aftermarket Bigsby, you'll want one or else you'll be out of tune when you use the vibrato and you'll eventually break strings on the saddles.
But I like the natural, it's like my Hondo's mapleglo finish. Sure, I would rather it was a nice color like jetglo or white or something, but I don't mind that natural finish.

