I am pretty happy with the progress of this personal project. I am currently working on the skin layer and manually sculpting skin details with Zbrush's Standard Brush and Alpha 39. I built the arm by dynameshing the internal anatomy I created earlier. Once I had my rough sculpt done, I decimated it and did the retopo and UVs (UDIM) in 3dsMax. Details of the hand are mostly done at this point...moving up the arm and then onto texturing.