Blender to Starfield advice

I'm not sure if this should go here or in a starfield community but I figured I'd start out here and go from that. So my dad really got into modding with starfield specifically. He's asked me to make models for certain things like the weapon I posted the other day. Essentially our set up is I model it and texture it, he ports it and makes it work. Does anyone have any advice on how I should approach my models to make it a bit easier for him to port them over? One of the things he mentioned was it might be wise to have less verticies but when I try to make the objects have less it makes them look really jacked so I'm not sure how plausible that one is...