Sequoia97, What T-man and Ed are trying to communicate to you is that they'd like to help, but need more information from you to do so. Can you post pics of the instructions or your apparatus? As Ed pointed out, a trestle is a single structure that is usually a truncated "A" shape...a bridge can be supported by a series of trestles, the 'legs' of a trestle bridge. Lamina are, in general communication, as series of flat surfaces arranged as a series of plates, like the gills in a mushroom. We're trying to envision what you're building so we can help. The manual T-Man posted showed a basic set of trestles arranged in rising sequence; picture a similar series with gradually taller flat sheets and you have one example of a laminar trestle. We'd like to see what yours (or your instructions) look like so we can help.