Lovely work Alan, coming along nicely. I'd be interested see what one of your obliques looks like.
I also enjoyed viewing the holders you created in your post. Beautiful wood carving and use of color. I luv the variety.
My oblique experience was trial and error to learn how to make a flange to rotate the nib and build a bandsaw jig for various cut angles in the pen body. I experimented with tilt of the flange as I wanted to learn what may or may not work with the nib. A number of the initial obliques positioned the nib at too steep of an angle and those pens ended up in the trash. Its good to experiment to learn what may works and what to avoid. Its also fun to try a variety of pen body shapes.
Some pen holders have double sided oblique flanges and a combination of straight and oblique. Not sure if there is any real need for a double sided oblique holders. In 26 Seeds we often letter with double sided straight holders.
Now that I understand the process of making an oblique I will eventually do an elegant oblique with multi tone wood.
Alan