All of the WWI vehicles I've worked on were done using FF&S, although I use a couple shortcuts (I use the vehicles' recorded speeds rather than calculating them, as an example). The American Civil War portion uses WTH as well, since FF&S on its own doesn't cover black powder.
For adding dinosaurs, the core TNE rulebook will probably be the most useful, since it has the rules for creating aliens.
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Writer at The Vespers War - World War I equipment for v2.2
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