My kitten's HUGE!

Lol I just weighed him this morning and he's about 10 lbs at nearly 6 months! He's just a regular domestic cat, his mom was a petite 3 legged lady so I guess his dad must have been huge. He also always had big paws and a long tail so we knew he would be big, but the vet had estimated him to be around 12 lbs fully grown. We still haven't neutered him yet (he's scheduled to go in October) so I was wondering if that's a factor to why he got so big? Also he's not fat so I guess I'm not over feeding him but I'm wondering if I should start measuring out his food/feeding him on a schedule rather than letting him eat as much as he wants?

let him eat as much as he wants. The Rogue was like that. Enjoy! The Rogue grew up to twice that size, and a character to match. However, whenever you get him to a vet, ask them to listen in to his heart. Very big cats are known to have heart trouble (the Rogue died of this at an early age) - not to scare you, but keep an eye on it.