The definition of custom made is one point that has not been uniform here, what can you change in the making process from a stock bat to a custom?
Cleft, first and most simple, you can try and find a cleft that looks right, you might also be able to find one with a lower density.
Handle Length, simple again, you choose Super Short, Short or Long.
Blade Length, standard or modified, i.e 1 inch longer blade.
Pressing, this one is an odd one, I find those with a poor grasp of pressing will allow you to specify a change, pressing is subjective and the bat maker will always being looking for the optimum pressure point when pressing. For you to want a press either side of this peak will lower the performance and if on the softer side can result in a softer blade which is likely to crack more, on the harder side a bat that may last longer with reduced performance. I used to believe that a light press gave more power before I understood the process but now know better.
Shape, mostly personal preference.
What is the difference between "Handmade" and "Machine made"?
Again I'll work through the basic process,
Raw cleft has the waxed ends sawn off, the edges trimmed to size and the face planed. All these processes are done by a person with the aid of machines on both.
Splice sawn in cleft and handle cut to match, both done by a person with the aid of machines.
Shaping, this is the difference, handmade requires the cleft to be shaped by hand, machine made uses a lathe to shape.
Handling done by hand, pressing done by hand in all stages, finishing done by hand, binding done by hand with machine aid.
Not a lot of difference really, but a lot of difference in the quality of each process between firms.