Read the description. You can't download it from the workshop it self.

I know, I didn't.

if the model is invisible, it means you installed it wrong (the model folder is in the wrong directory)

When you open the download file, select both models and materials, and drag them ontop of your mod (usermod, workshop, any custom mod folders you got, etc). Let the computer do the sorting for you or you might make some mistake like putting the models folder into your models folder, which messes up the directory.