Thanks everyone. After thinking it over more and reading all the opinions, I guess I'll try my hand at making another riser for the limbs. I believe that the bowyer is no longer making bows and I wouldn't ask him anyway after the experiences that several of my friends had with him.
To this point all of my bow building experience is with selfbows so this will be something new for me. Also, since the bow will ultimately be for my oldest son, I think I'll get him involved as well.
Again, thanks for your replies.