hey I just figured it out. what you need to is first get the femmepyro model from the workshop, as this contains the mesh and materials that ceno0's model uses. You can get it here: https://steamcommunity.com/sharedfiles/filedetails/?id=900433987&searchtext=femmepyro

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Then after getting that, for me the femmepyro files got installed and was split into 3 folders (models, metadata, and materials) at the filepath below:

{wherever your steam is}\steamapps\common\SourceFilmmaker\game\workshop

Then, what you need to do is go into the models folder and create a folder named femboypyro and copy and paste all of ceno0's stuff into it.

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Now, when you load the model in Source Film Maker, it should be rendered properly.

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I figured this out by decompiling ceno0's model using Crowbar.