Third magnet real cool I would do it but if you don’t want to do it pm me and I will buy the kit From you.
You can not go wrong with comet or pinball life leds.
Side mirrors are cool but get scratched up easily I had them in my Metallica and they got scratched and I did not lift my Playfield offen.
Rubber I would go with Titan or supper bands.
Clock i would go with a clear face and maybe a clear housing it looks better in my opinion.best clock board https://www.german-pinball-modular.de/final-tz-clock-pcb-english.html
Best mod pinsider twister makes it is a mini Playfield switch kit.
https://pinside.com/pinball/forum/topic/twilight-zone-owners-club/page/129#post-4625780