I'm really digging this one. You can drop the tag line though since we're not entirely sure what we will use. One of the things that immediately strikes me as needing to be changed is the green arrow between the words Build > Parts... I believe this should be one word and ".com" should be included. I like when the "Build" is one thickness and the "Parts" is another. Great job btw.
On a side note,
#34 has a little Icon (the gear with the "b" in the center) could you make a version with that? I could be wrong but that might look nice.