What about Cranial Plating? Has anyone ever tested those? Combined with Manlands (Factory, Blinkmoth Nexus and Mutavault) and Crucibles they might be pretty good. Another possible inclusion could be Skullclamp, clamping away useless Metalworkers or the same Blinkmoth Nexus again and again, thanks to Crucible.
Appletree
Skullclamp is good, but only really works if you have a sac outlet (ala Ravager) online. Otherwise it's just insurance if your guy dies (but you don't truly have a way to take advantage of it otherwise). Crusher is good, and I think works incredibly well with Triskelion (obviously), since he's basically an Artifact Dryad.

I am curious why more Metalworker lists don't run a single Staff of Domination in the MB, simply for that "oops, I win" factor. Especially if you run Crusher, Worker/Staff can let you play out everything, pump up your Crusher with tons of counters, sac it and Modular it to Triskelion, then just kill them right there (ala a nice Combo-ish finish), or even just swing next turn with a bunch of big robots.
I'd like to second xycsoscyx is asking why none of these lists run staff of domination? Originally my list ran it as a one of, but was eventually upped to three because staff alone is really good in the meta, and so is winning out of no where turn 2. Personally I cut the ravager for bigger robots just so null rod isn't a complete beating, but laying down 5x sphere 4x wire and passing turn has never been a problem
All of those options were discussed in the article, although not extensively.