We were on the same page. I also built something similar for a Conveyor company here in Canada in the early 90's. We parameterized all their tech drawings (or at least the initial versions) from their component libraries. Was a great project. Not sure how long they used it, they eventually acquired the resources to support it internally (I was an independent AutoLISP contractor). Good times back then. I haven't done AutoLISP in years now but great to see it's still around.

Ha, so I wasn't alone! Conveyors are a perfect fit - standardized components, parametric variations. The pattern was obvious once you saw it. Good to know it worked for you too.