Yeah, you should also make sure to add the cost of the tools for building it yourself. Most bike tools are specialized for bikes only. The only thing I don't have is a headset press so for this I take the frame & fork in to have that done. The rest I may have another $100-150 in tools invested.

If you have a co-op in your town, you could take your parts in and use their tools and they usually have a mechanic on premises that can help you if you have any questions.