Lee Williams 1

Hi guys, Im more of a builder than flyer and I was wondering if any of you out there can give me some advice? I would like to know if anybody knows any software out there that can take a 3d model of a plane of my choice and produce the rib shapes for me. So I can use the rib and stringer method of building. I would love to not have to rely on existing kits as I own a cnc machine and would like to do the whole process from start to finish. My only sticking point is going from a 3d model to producing the ribs for the fuselage/wings etc. Thanks in advance Lee