Yeah, keep the Urza lands for decks that don't require color mana and for when you can put 4 of each. The odds of actually drawing an Urza tron are close to nothing when you have 2 of each, especially in a high card deck. It defeats the point. But Urza lands are amazing! Keep on building! :)
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I would take out the bruisers and the hybrids. They aren't worth their mana cost. I know Arcbound Reclaimer fits in with the modular, but Scarecrone would be a better option for bringing your creatures back, especially with higher costing creatures. Personally, I love Urza trons. They are so useful in colorless artifact decks. Once you get a tron, you can play anything. The Energy Chamber is good idea, but with a modular deck you don't need much +1/+1 counter generation, especially with those Overseer's, because you don't loose the counters. I see that this deck isn't totally built around getting certain cards, which is good, but it's also good to consider the amount of cards you are running. An 88 card deck is really going to lower your chances on acquiring an Overseer or even an Urza tron. I tried building a modular deck, but it was a lot crappier than this one because I didn't have any cards that I needed except for the Arcbound creatures. And yeah, don't bother getting Ravagers. They aren't worth the 15 bucks if you are only going to use it in a deck that doesn't need it like an Arcbound deck. They are a lot more useful in artifact token generation or something.