I’d like to share the result of my low poly exercise, during which I have practised UV stacking, baking in Marmoset Toolbag and UDIM workflow in Substance Painter. Here are renderings of the high poly model: https://www.behance.net/gallery/122105581/Amilcar-restored-%28Cycles%29 https://www.behance.net/gallery/112870517/Amilcar-C6-high-poly-model
Average UV space usage is 75% and average texel density is 2600 px/m (more for areas containing fonts). Now I think this TD might be a bit of an overkill, but at least it still holds the details well in SD texture quality. Nevertheless next time I will target 1500-2000 to save some UV space.
Hope you like it!