Purr Bug!
Comes with FBXes, SPPs, PSDs, and a simple out-of-box unity package with everything you need for uploading the sample base preconfigured in a couple clicks.
A few tips:
If you do customizations in blender, mind the split mode normals and extra bones that use weighted VRC constraints to move.
The model import settings aren't default, and you may want to touch up the humanoid rig muscle settings if you use a custom FBX.
Add smoothing groups at your own peril, as some normals are baked and will hate lighting with blendshapes on unless using legacy blendshape normals.
The substance scene is custom, which is nice, but remaking it in a compatible way might be a little tricky.
A few of the baked textures are unsourced, such as the chest blendshape normalmap, so you may need to export from substance (if you have it) or recreate em if you change up your UVs or mesh.
The VRCFury is mostly only used for SPS, don't worry if you think you'll need to work with VRCF prefabs.