This> https://www.xbox.com/play/media/8kkTFAZs2U
Is clearly 100% a massive duping glitch base on official Chernarus European server 3945 in servograd
My brother has played with dupers who shoot crates and it spawns a fully built tower. This would explain the size and speed they've built This.
Please sort these bugs and cheats. It's ruining the game for normal decent players.