Thanks for the feedback! yeah the normal map doesnt seem to be right. it is a bit curvy on the flat sides, so I guess I did something wrong with the baking. and I baked it on top of a cube that's why the bottom part is completely black. I changed the diffuse by adding some leaking stains and I made the damaged parts a bit…
Kinda finished this model by now. so I decided to update this post! Workorder: -Highpoly in Zbrush -Retopology in Topogun -Unwrapped in 3ds Max -Highpoly to Lowpoly baking in 3ds Max -Photoshop for textures -Realtime render in Marmoset Toolbag Zbrush: 3ds Max lowpoly: Marmoset realtime Render: Textures: Diffuse: Normal…