PBR Spec/Rough
Rough_Texture maps: Base color, metallic, roughness, normal (8\16_bit), ambient occlusion.
Spec_Texture maps: Albedo, ambient occlusion, Gloss, Specular
Guitar_deck Textures resolution: 4096x2048px.
Guitar_fretboard Textures resolution: 4096x2048px.
use 2 material ID
1 - Guitar_deck
2 - Guitar_fretboard