There are some great fan-designed 3D models, many very faithful to the original blueprints, that a snapshot could work quite well for a tabletop battle-grid. Credit always goes to the 3D modeler. I only add missing bits and a bit of colour. Search here for the full series.
The ever-prolific Atherin‘s U.S.S. Republica B model is the basis for this version of an Excelsior-Class (Refit) bridge.