Directions for San Juan Engineering Trestle module (bents?)

I recently came into possesion of 5 San Juan Engineering Trestle Modules. Should be enough for 10 bents, but I can’t find instructions and google didn’t give insight other than the company has been gone for 30 years…

Does anyone have instructions for these? I’m just curious because I may wind up trying to get rid of them or make them shorter for a module I’m working on.

I’d bet if you searched the magazine indez, you could find several helpful articles on scratchbuilding trestles. It ain’t rocket science any trestle kit that old was probably close to scratchbuilding – except instructions were included at one time…[;)]