TLDR
This is not a Full Guide, but you provided enough information.
It'd be great if you include some information about situational and core items.
What to build against squishy heroes and what to build against tanky ones?
You can't simply throw away a 6 item build guide against everything. There is no such a thing.
But you pick the correct items, mostly.

I don't agree with 2 Energy Battery at the beginning.
It is hard to farm with Skaarf without CP, you need at least 1 Crystal Bit.
I always start with 2 Crystal Bit, and then I buy Energy Battery and Sprint Boots ASAP.
But this is YOUR guide, NOT mine.

You get the things wrong here:
"(...)Buying two Energy Battery at the start allows you to spam abilities in lane and be much more of a lane bully."
Energy Battery does not allow to spam abilities, it just gives energy recharge and energy points.
You will still spam the same exact amount of abilities at the same given time, with or without the Energy Battery , but you sure can sustain slightly more energy at the lane without having to TP to base, and maybe it makes a difference on farming early game.

The other topics are pretty much correct.
Just a few people is aware of the 3 Goop you explained. Congrats!
He's my main hero since forever.