I was being a bit generous with the magic items, because I would probably just use a cloak of invisibility, Armor of force resistance, rod of absorption and various potions like Storm Giant Strength, Growth, Flying, Speed.
I'm still not using my actual magic item equipment because I think it would be a nice surprise.
Again, not trying to get into the build argument, but since you changed your magic items. That is quite a list of magic you are suggesting:
Cloak of Invisibility (Legendary)
Armor of Force Resistance (Rare)
Rod of Absorption (Very Rare)
Storm Giant Strength (Legendary)
Flying (Very Rare)
Speed (Very Rare)
So, you want two Legendary items and three Very Rares... only the potion of Growth is uncommon. The value of those items well exceeds the DMG recommendations (pg 38) or the guidelines I suggested in the OP.
Not that
any of that really matters, but it is a bit beyond the 1500 gp worth of powdered ruby for Simulacrum that started this newest back-and-forth.
A wizard and his simulacrum can both be Invulnerable (unless the simulacrum was created by a
Wish, but it isn't even needed really...), See Invisible (no concentration), and pound any martial build with evocations spells for enough damage to destroy a small castle. Choose a flying race or Winged Boots or any flying magical item, and it removes that dodge as well.
In summary, no martial build (short of having an artifact or relic) can really compete with a Wizard, let alone the Diviner, especially if they are prepared.