In an OKH order dated 1943-12-29, Zimmerit was to be applied on the
- Pz.Kpfw. III,
- Pz.Kpfw. IV (100 kg.),
- Pz.Kpfw. Panther (160 kg.),
- Pz.Kpfw. Tiger (200 kg.),
- Sturmgeschütze (70 kg.),
- Panzerjäger 38t and
- Panzerjäger Hornisse
So your tank has no zimmerit. Lucky you!
I know the "s33" from Tamyia, it's pretty common. You will surely find photos with the model already done on the net. I have seen many before.