The three-dimensional model was rebuilt from one plan — and the parts without data were left unpainted.
The model has two textures. Areas confirmed by the drawing are made of tinted wood; areas known only approximately are of unpainted card.
This is visible at a glance and needs no explanation. The museum says it first considered finishing everything alike and adding a caveat below, then dropped the idea: few people read caveats, everyone sees a change of texture.
