Looking good. That first ones a beast.
Its good that you are a machinist. Prototyping 4-5 at the same time is a ton of work (and money if you arent a machnist). Trying to launch 4-5 yoyos at the same time will take a ton of money. I am assuming you are protoing a few shapes an then will narrow down to 1 or 2.
FYI in case you didnt have this info already. I figure about 6-7g for axel, KK bearing and silicone.