Would an Experienced Min/Maxer Care to Help a Fool with his Siege Ballista Idea?

Hello and thank you if you're taking the time to read this, whether or not you end up sharing some of your time past that. If you wish to skip all the rambling and get to harshly critiquing my idea in Path of Building, the link and idea behind the build are near the bottom. The main points of the build are bolded for convenience. I apologize for only giving a pastebin link to use in PoB, I don't think it's worth being flashy unless I plan to make a guide about it. ...also I don't know how and don't have the patience to figure it out no matter how easy it is, for now!

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Betrayal League is the first time I've seriously played since farming Dominus was more or less considered "endgame", and I've been rather fascinated with a few skills, one of which is Siege Ballista.

I'm in no way experienced enough to really theorycraft amazing builds, nor am I looking to pioneer the meta's Next Best Thing. I'm just someone looking to have fun with things, but I want to have fun while making it as efficient as is reasonably possible and my friends haven't been very helpful.

That being said, after spending a good couple hours considering base class, ascendancy (I might have tried to make it work with Hierophant Templar initially...) and items, I think I have a decently solid starting idea but I can't shake the feeling that I could be doing it better. I'd appreciate if someone who knows a little more about the skill, or totem builds, or just have a knack for minmaxing an idea to heck, would review the build and advise me on how to better achieve my vision. I don't need to farm endgame with millions of DPS, I just want to be able to DO it.

The PoB link is: https://pastebin.com/sp8uzbzb
In short, the build's idea is a Deadeye dealing almost purely physical damage with high crit chance using Siege Ballista, as well as Lightning Arrow and Frenzy more for their utility than damage. It's designed to Maim targets while providing damage bonuses when they're Blinded and/or Bleeding as well as using Frenzy Charges and Shock procs to further amp up the damage.
Survivability is questionable as Life is on the low side and evasion chance could probably stand to be higher pre-blinding. The gear is mainly Uniques, and all gear stats are cranked to their maximums in PoB as a "best case scenario" (might have missed one or two).
The DPS calculator is pre-set to Shaper/Guardian as target with all applicable statuses enabled. Flask 1 is blank, but will likely be a healing flask in the end.

I apologize for the wall of text. I'm looking to know if/how the build can be improved without turning it into an elemental build or NOT a Siege Totem build. Thank you for your time, especially if you read the whole thing or have taken the time to assist me. <3