For me zbrush is a nightmare so i keep away from it.If you have a specific goal in your head you have other options. For example if you want to import it in UE4, you can use mesh decals with pom. Even if you still want to go through the traditional workflow of baking down from hp, you can have floaters in the hp and have…
If your end goal is a real time engine you might want to do some softer edges. And small stuff like those vents at the front you might want to rethink your approach. You could do them in painter/ndo or use floaters instead of all that topology mess. Dont get me wrong its not just your topology but in general small indents…