Trestle jig

I am ready to start scratch building approximately 15 feet of trestle on a grade up to 18 inches high. I’m going to rip my own lumber. My question is - Can anyone provide me with plans/dimensions for laying out a jig to construct the bents? I have seen many pictures but so far can’t find dimensions or plans. This is for a G scale logging railroad layout from the early 1900s.

I have a few plans here: http://homepage.ntlworld.com/sheila.capella/cabbage/trestle.html regards ralph

That page and information is an absolute treasure. Exactly what I’ve been looking for.

I have a CADD drawing i can convert to a PDF but if you don’t have a large 24" x 36" plotter availabel it is of no use to you.

Thanks for the input. All I really need are some measurements. If the CADD has that and would be visible on the computer screen I think that would help.