This here is a boiler I modeled back in 2016 for a canceled video game project. This was pretty early on in my 3D works so I was basically going for what looked good. I didn't really grasp how low-poly video game models needed to be or knew any tricks for keeping it low poly with higher details, resulting in this model having an extravagant poly-count in certain areas. It looks alright but putting this in any game engine might crash the system.
Looking back, this isn't very well made. It looks pretty good, but the topology is weird (hence the shading artifacts) and the UVs are a mess. I think I might use it to make a new one at some point.
Modeled in Blender.