Then and now.
Barely ten years after Star Trek
ceased production we saw tie-in merchandising unlike anything we had known before. It was fascinating to see such care and attention to detail for a subject matter generally not given much thought beyond fans. FJ also had an advantage of access to resources that fans could only dream of. The best we could do was work off still shots and memory and rewatching episodes (no VHS tapes yet to pause and freeze frame).
Since archival material has been released and shared and fans have access to tools (Internet, DVD and Blu-Ray, CAD and 3D modelling as well as some fairly decent reference books) To a large extent we can compete with the pros even though some of those pros were/are also fans.