Great posts and pictures above.
@Trestleman1 created an amazing trestle seen in the link below.
https://ogrforum.ogaugerr.com/...look-at-this-trestle
As someone who has not built a trestle before, I found it interesting that he built it upside down in order to keep the track surface on a level plane. Once it was flipped over, he could shim/fill any gaps between the benchwork and the base of the trestle.