I use fill ports as well. I had a hard time filling between the grommets, it's easy to leave too much air inside. I couldn't use the vet syringes with the rubber plungers because the rubber taste ruined my juice and tasted awful. Most people don't seem to be able to taste or smell it be boy I could! I switched to medical syringes and they don't give off a rubber taste or smell. Yours look great!
I don't mind the screw sticking out at all. But if you don't get the right size drill, tap and screw, air can leak in through the fill port, around the screw and that will cause flooding and leaking as well.