Hurricane is amusing and rewarding enough to use that it warrants using it. It's also useful enough to warrant using under non optimal conditions in not being totally useless. Basically in a ranked game, tl;dr it's not BAD, but it's a slot you could strategically be using for an item that is BETTER. But I love using Hurricane on Ashe, and will build it in almost every senario I can. I don't rush it, I might a few games if I'm ahead, but otherwise I chose to play Ashe for a reason, so I'm gonna play and build her for the same reasons.
Not sure about the synergy of how the bolts and BoTRK would work but I doubt it would. If you're gonna run cleaver, consider things like Wit's End and Frozen Mallet, and Black Cleaver, all of those on hit effects will proc of the Bolts so with Ashe's passive Hurricane and Frozen Mallet, she can basically in theory lock the entire enemy team from escaping or in theory (dash moves aside) kite the entire enemy team. If you build Hurricane, note is has no Crit, it's just Atk speed and passive. So either directly buy into a 80 AD item after wards or have already bought one before hand. If you start off with a Crit item like Shiv, go into PD next.
If you max q first go with Staik Shiv and crit items. IF you max her w first go with IE and high raw AD items. if you max her e first, you sly dog you!