Definitely less volatile without the Precursor Golems, although I'm still trying to fit in the Sylvok Outcast/Unlife combo into mine some way or another even though it doesn't go with the theme. I like what you've done though, the only thing I feel it misses out on by excluding green is the Maul Splicer which I have found to be extremely useful with mimic vat.
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The reason for the unlife combo in the sideboard is I couldn't think of anything else to put into it. With this build, it's quite difficult to decide what to board out, as all of it is pretty crucial to the deck's focus. Any input would be greatly appreciated since this is still somewhat of a work in progress. Also, I'm unsure if Mimic Vat and Birthing Pod could work in conjunction the way you described, as Mimic Vat puts a token into play, I don't know if it would still have a mana cost since it is no longer a creature card. I sure hope it does though.