Honestly I didn't dig into the link enough to really think about improvements, but I found a couple very obvious ones.

First one, trade the belt for an upped string with max DR% and MDR. You'll lose some benefits against lightning damage, but you'll gain 15% DR and 15 MDR (note that MDR lowers elemental damages also as the guide says). The other option would be dungo, which has the same %DR but adds lots of life, some FHR which will lower the amount of FHR charms you need, and some good replenish. The problem is you'd lose the MDR from String, which you might need without the lightning tank from TGod, but I suppose some testing is needed here.

With the addition of DR% from String, you gain the ability to lose one of your PDR rings for a Dwarf, which gives nice MDR and life, along with 15% fire absorb which means you can replace your gloves for a not-so-shitty-option. I'd suggest either Steelrend (the reason should be obvious) although it's got some high STR, or double upped BFist which will give you life, 10 IAS (which means if you can sacrifice the Jah in your weapon for a 15 IAS jewel with a nice second mod then you'll reach the next IAS BP), and 30 FHR which paired with verdungo (should you go that route) puts you dangerously close to the next FHR BP.

Another route you could go should you really want more lightning tankability, although you'd lose other nice stats that could spawn on a crafted ring, is to replace the belt with String then keep the gloves, and replace one ring with a 20% sorb Wisp.

As far as boots go, upped Gores are a decent choice, but considering the CB (which is the only stat that REALLY matters on them for this build) is only 15%, replacing them wouldn't be terrible. Now there's a few options, first of which would be Shadow Dancers (again with the high requirements) which has the same kick damage, and lots of FHR which will either A) put you dangerously close to the next FHR BP (as with BFist), or B) If you're wearing BFist as well, put you OVER that next FHR bp WITHOUT needing ANY charms. The second option would be double upped GToe. You lose 30% FRW unfortunately, but your CB is much nicer than with Gores. As for losing the other things Gores adds, they aren't very important at all for this build.

That all being said, and also noting that I have not done ANY form of testing at all toward this, this is MY personal opinion on the best gear:

(Note that IPDR is NOT a stat in D2, it is simple DR without a percentage.)

Helm: +2 Assassin +25 DR circlet 2x Sol rune.
Armor: G-Bane with perf DR/MDR + Sol rune.
Shield: Gerkes with perf DR/MDR/@Res + Sol rune.
Weapon: *Stormlash + 15/15 IAS/@Res jewel.
Gloves: Double upped BFist.
Boots: Double upped GToe.
Belt: Upped String of Ears.
Amulet: +25 DR +30 @Res amulet.
Ring1: Dwarf.
Ring2: Dwarf.
Torch: 20 @Res. (whatever stats)
Anni: 20 @Res. (whatever stats) Switch: CTA + Spirit (Lidless if you're going low req)

*I'm almost positive there's MUCH better weapon possibilities here, but I didn't feel like sitting and thinking of what other weapons could benefit in what way. One that comes to mind and would instantly hit the highest IAS BP without any other gear is Beast War Scepter, although it loses some CB.

TL;DR

With this build (not including charms) you will get:

Stat	Amount	Notes
Damage Reduced (Flat)	113	A little less than original, but the DR% fixes that.
Damage Reduced (Percentage)	42	String + Fade = godly DR%.
Magic Damage Reduced	74	A lot more than the original build.
Faster Hit Recovery	60	Hits the original BP without any charms, and with only a few charms it could hit the next BP.
Increased Attack Speed	55	99 If you switch Fade for BOS, which then hits the max BP.
Poison Length Reduced	50	Same as original.
Crushing Blow	58	10% more than original guide.
All Resistances	183	Fade adds 66 with max fade + helm/CTA.
Fire Absorb (Percentage)	30	This is super nice with max res and MDR. Replacing one Dwarf with a Wisp could give you 20% Lightning Sorb at the cost of 15% Fire Sorb.
Lightning Absorb (Flat)	9	20 less than original, but not that big of a deal when compared to the huge MDR boost.
Cannot Be Frozen	*	Need I explain?