You can absolutely build from an existing model! That’s what I do for my doorways mod - although I’m technically “deleting” from a model, but that’s not the point. Navigate to the /mods folder inside your game directory, rename stonehearth.smod to stonehearth.zip and then you can extract all the files. I would recommend doing this in another folder (not /mods) as the game prioritizes folders of smods and you don’t want to accidentally change/delete something and break your game. Once extracted, you can find the model files as *.qb. For example, a wooden door is located in \stonehearth\entities\construction\wooden_door\.
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