Here are some resources. Ask Joe for a paper copy of any of these:
Build Your Own Telescope, Richard Berry, Chapter 7, Building a 10 inch Dobsonian Reflector. Click here for .pdf.
Try CTG Engineering, Jerry Option, Sky & Telescope, June 2022. Click here for .pdf.
Five Numbers that Explain a Telescope, Cosmic Pursuits. May 4, 2016. Click here for .pdf.
Five Numbers Worksheet. Click here for .pdf.