Hi mate, your bonnet louvres look good by the way good job. I like using a rubber block for rubbing down , as i find it will shape up better. As for the mopping lol, This is a machine that runs at a steady pace ,a bit like myself these days

, you will need polishing compound, maybe a g3 or like . If your looking for a nice flat paint finish , you will more likely to get this in a spray booth. So im thinking your painting in a small garage , make sure you well ventilate and wear a decent mask . I dampen down the floor prior spraying as to stop any dust being kicked up by your self. Wear paper overalls also to help dust,and take your time .
When your ready for the polishing stage, i surggest flating down the paint starting with 1500 wet and dry to 2000. You can even buy 3000 for final , but thats up to you. When you have flatted and dryed up, apply a small amount of compond and keep a water spray bottle to keep the area cool when moping. Do one an area time , you might need to repeat a couple of time depending on paint finish. Keep the mop away from edges, and dont hold the mop in one area as you will burn paint!!. nice side to side flowing.
Its all a practice , its your first time , so all i can say , is mega preparation and degreasing prior primer and paint , plus take your time.