I don't have a lot of experience using precarves of Hawken rifles from too many companies. But I have seen several from TOW and they make up into a fairly respectable Hawken. Of course,if you're serious about authenticity, go to Don Stith...arguably the superlative Hawken precarve source.
I have a feeling that many of the precarved stocks available from a variety of sources, may be interpretations, built around the parts that are available readily and easily commercially. That's all fine, but these often miss the nuances that make a Hawken rifle, and not a half stocked percussion rifle, which is all you can call a T/C, CVA, Traditions, or the like. Replicating a Hawken, even with its inherent diversity, requires careful and dedicated study, as with any other firearm from antiquity. It is unlikely that a new builder with all the enthusiasm in the world, if going to nail it with his first build, and perhaps, not even his twentieth. I know for myself, that there are many areas where work still needs to be done to get it right. But I am willing to try and try again. It's an interesting and fulfilling journey.