When I looked at the picture of the metric thread chart I assumed that the exact same size bare spot to it's left was where the missing imperial chart was supposed to be.
August and September 2021 issues of Model Engineers' Workshop has a rotary table build. I believe they had another one in the past. I will look through my back issues.
Here is my second engine,after a wobbler.
It started out to be an Elmers Wood Beam. I got as far as the cylinder assembly and changed my mind. Kind of took bits and pieces of several designs (mostly Elmers 37) and scaled it up a bit to fit the cylinder assembly. Worked with what I had on hand...
I found this in a box of old papers and scanned and cleaned it up the best I could. I may have a lead on a lead to the full drawings but figured if it was something common somebody here would know.
HWF