in my opinion you use too little artifacts too really abuse Worker.
and, partially because of this;
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Sculpting steel, copy metalworkers or Lotus's for tons of mana.
you never gonna copy one of these. if so you're moving way to slow. when copying metalworker you either have no artifacts left in hand, or just were able to play all other artifacts immediatly. and pay three to copy a three mana source? sure afterwards the're colored, but it's too slow, and too often useless here. and Lotus restricted, you can fabricate for lotuses though if you're moving slow anyway.
you should have mana vault as well though. and if playing artifacts, why not disruption as Sphere?
and hm, wouldn't you want to add some fetchies instead of all these colored lands? this way you'll often have useless colored mana, and with fetchies or even painlands you can support wastelands/strip.
just some thoughts
Arthur