Well, you cry and play another deck!
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It is not a serious deck, but still it can be interesting to work on it!
Well the first problem is you are over 60 cards (which is normally a problem if you are considering tournament play). Since you seem to want to make this an extended deck, it's probably best that you stick with the extended slivers with the better abilities and mix them with the new ones. Since there is a larger Cardpool you can cut it down to 1-2 colours unless you really need to make it more. I will post a link to an extended sliver beatdown deck.
I updated the deck, the mana base is now ok I had difficulties with the deck creator :P!