Reviving this thread in light of the new combination formula. Is there a plan to add making axe handles to the axe making book? I just tried making an axe and had to attach my Q239 blade to a Q50 handle, leaving me with a Q145 axe kit. Without the ability to craft axe handles, the best anyone is going to be able to do is a Q175 kit, and I suspect improving this to finest quality in the final assembly step is going to be a real challenge regardless of skill. Shield making may be even worse since it requires adding a purchased core and handle to the shape right before the final assembly.
I suspect things like alchemy and cooking will face similar challenges with items that only go through 1 transform before being combined in the last or second-to-last step.