@its_virgil
As Don just said, "Ken Nelson at kallenshaanwoods.com is the master" ......... I certainly agree whole-heartedly with that statement.
Any pen turner who has not used a few of Ken Nelson's laser cut pen blanks has missed a very delightful experience in pen-making.
Ken has developed his skills in that area to the sublimely superb, in my opinion.
Anybody with a lingering liking for assembling a jig-saw puzzle should feel very gratified after making a pen with a Ken Nelson blank
Now back to the issue raised by the OP
@crashgtr ......
" I am not sure how to go about creating each of the cuts so they fit together on the pen tube "
I just assumed that the laser cutting is controlled digitally and that you simply program in the precise details of the cut parameters and the specifications of the shape that you want. . If you make complementary parts, I assumed that they would fit together nicely.
But maybe I am oversimplifying ..... perhaps there is more to the process than that ..... especially if different woods are involved.
@Joebobber , in his post above, seems to suggest that the process is actually pretty much just as straight forward as I thought it was.
I would love to read further elaboration by Joe about his experiments, and also to see pictures of the results, if that is possible, please.
This is a subject that has fascinated me for a long time. . I have actually made a lot of pens using Ken Nelson's blanks and I love them.