I'd build a life-size mech suit to control.

a monument representing how cool is scp-999 for me :)

My friend said a girlfriend lol

I'd build an M416 replica.

A gun for dr clef because he needs more guns

build a replica of scp 3812 that i can control. the scp foundation could never get me. >:) not even samsara

Airport

Why would anybody build a superhero-like thing?
It's not like you are ever really gonna use it
And don't give me that load of bull about "I wanna save the world" because we know damn well you ain't saving nothing without any proper training and you will not get any proper training
Sorry to say but your mech is useless and the FBI/CIA will take it away and erase all documents of it

a miniature SCP 173

Would it be strong enough to snap a neck like the real thing?

nah, probably just a bee sting level pain

my own universe

A gun and school

a Lego warzone so I can make my Lego lore reality

Whatever I feel like at that moment.

Thank you, thank you! You're too kind.