Yeah seems the collision box has been changed, best to remove the hatch.

as of the current build of the game, upon pasting in, the vehicle flips on it's roll axis at a constant rate. deleting the door grid from the info menu causes it to stop rolling. i'm not sure how to fix this besides a minor redesign without a rotor driven top hatch. awesome design though, gives me lots of ideas for my own builds, thanks for sharing!

Wheel suspension

Are those wheels on a suspension or wheels on a rotor

This is tight af

You are the second person to tell me it looks Russian lol. Now, I never said it was a tank, just a vehicle capable of survival play and dealing some damage. There are plenty of military vehicles with exposed wheels and you can afford to lose 2 or 3 before it really starts to affect the functionality.

Looks good. Resembles Soviet "BTR"-series APC to me.
But I doubt it's toughness in Space Engineers environment because of exposed wheels. I think whtey need some kind of cover, cause 1 missle will cripple whole thing. Or prolonged bullet rain :)