I'm not sure I'd say your section in the "spoiler" bit is a spoiler but here goes
Now with the final part, I am having to figure if I'd be able to go see this for round two with my dad n co. My step-mum has concerns on the length for me 10year old bro, but I'm more concerned on that fact that without the grown up brain to understand out-of-film implications of financials, contracts, film techniques etc he'll leave it with nightmares for years to come.
As you said, it's not 'gory', but I'd say for a kid that doesn't process it as special effects and actors there's bits that might not go down so well.