Hello,
Here you go, nothing fancy, but hopefully it will give you what you need. The 2nd page of the PDF will print full size when printed on standard 8.5” X 11” paper. The first page is just for reference, but I did include some basic dimensions to guide you.
Also I am convinced that the forward scope mount is attached to the flash tube so that is how I have drawn it up. I know that some believe that the mount is on the end of the barrel, but my research does not support this position. The point is that if you want to mount the front mount on the barrel you will have to revise both mounts to increase the diameter to allow them to fit on the barrel.
If you have any question please let me know.
Have a great day.
Alan
http://home.comcast.net/~wizardofflight/ESB_Scope_Mounts.pdf