hi. @grace I am about to go to the gym and I have a fairly full day but I will get it posted before I go to bed tonight. What I have is the first part of a 2 part tutorial on how to build the basic sleeve block described in McCunn's book. this is similar enough to the block that you started with when you did the bell and cape variations that I am sure I can tie it together and have it make sense to most readers.
I am still working on writing words to explain the sleeve cap and curve drawing that I did. what I already wrote is instructions on how to create the straight lines in the arm portion of the sleeve.
i have created the basic sleeve block, just going back and documenting how I did it. Also I need to segment the curve since I noticed that you have seperate points on the shoulder curve that you used in the rotation. I drew it, and have the lines that I can use to segment it, I just did not see a use for that. Now I do.