Be greeted!
So far, I played a couple of games at a tourney against a field of mostly Flash, GAT and random fishstyle aggro. At the end I went 3 – 2 – 0. The two losses are due to heavy mistakes I made, which I’ll not present to you. You would call me “stupid idiot” otherwise.

But now is now and I’ve learned from those mistakes. Anyway, I’m so lucky about your comments and your help and I’ll happily reply everything.
1st: Yes! This thing is far from being a tight and balanced deck as it’s not thoroughly practiced. Tangle Wire is already on my mind but since now hasn’t proven in testing. But from time to time I gave and will give it a new chance. I simply can’t figure out, why I’m so unhappy with it. I also must admit, that it might be better to go b/splash and cutting all those artefacts. But as the title states, this shall be a Workshop-NetherVoid-Deck, so I propose we try this until we all agree it’s senseless. I considered the combination of Workshop and Void the major aim of this thread.
2nd: Since now, playing Nether Void is rarely a problem. Neither the deck’s mana base nor opponent’s counterwall prevented getting it in play. Concerning the manabase, Void comes usually down turn two or three and Force of Will is usually already gone so far. If it’s still countered, then another thread comes through. But most of the time, it hits play.
3rd: I’ve to agree, that Gorilla Shaman deserves a spot in the list. As for now, I might cut the two Intuitions for him, as I was not at all lucky with them so far, although they seem good on paper. They can find lands for Crucible and artifacts for Welder.
4th: I’m absolutely settled on Urborg, Tomb of Yawgmoth. It is so good every single time it hits the board. It enables a 2nd turn Nether Void, if you started with a Workshop and offcolor artefact mana. I can also play the additional costs of a Nether Void with a Workshop, when Urborg is in the game. And it synergizes with Sundering Titan, because he can take out one more land – despite destroying tapped (Orb of Dreams) fetchlands or wastelands, possibly destroying two islands for example has proven very strong. Of course it is to be considered a drawback, that Urborg gives black mana to my opponent. But that doesn’t worry me: If they play black, they can play their fast and most threatening spells (i.e. duress) anyway.
5th: Balance is a fantasic idea, I honestly didn’t think off. Due to the evolvement of the deck I never considered colours other then b/u/r. The rainbow manabase was the last step setting the “drawback” of Sundering Titan to zero.
For now I hope, I’ve answered all your questions and gave you the input, you wanted to hear. Please be patient with me for the Workshop/NetherVoid-Combination

I’d be glad, if you’d stay on the discussion. Possibly and hopefully there’ll be more people to join us. If I finally adjust the list, I’ll do so in the very 1st post, because I feel, that always posting new lists ruins the clarity of the thread.
/Fossy