I've been trying to make a design for a project that I've been working on. and I am trying to design cylinders with triangles in them, but I seem utterly dumb because I can't seem to be able to...

the outer cylinder is 41 blocks in diameter (83 width total) and the inner 34 blocks in diameter (69 width total).

this is the design I have right now:
https://prnt.sc/3W2-zFjtb5-H

This design works for now, but I don't like it that much.

this is the layout in a grid:
https://prnt.sc/b6f3kcxPxOZ-

is there anybody who might have more expertise in this and can help me?
would be much appreciated!