I got my Grid Iron several weeks ago, and my accessory list was quite similar to yours.
I also outfitted it with a Tappecue wi-fi digital temperature monitoring system.
I recently also added a black ash bucket (from Lowes) to easily and safely remove ash.
Adding a battery powered magnetic base LED lamp has proved handy.
Several magnetic hooks are handy to hold things like the silicone gloves (I added short cord loops to each glove)
I made a few small modifications (adding a floor lock; a magnet on the knob, and a waterproof case for the Tappecue), and made a couple of short videos showing these mods
For anyone interested...
Floor lock:
Magnet mod:
Tappecue case