just to see what yall think don't worry if I'm not aloud to finish it its fine but I'm currently waiting for a reply heres inspiration:
hope this one isnt a default rollcage with stretched verts and improper texture like half your other mods but ill be honest, from what i can see it looks good
if your only going over the top, that'll do nothing, especially considering the angle its at notice how this image you provided has it encased its just common sense. if you tap someone in tandem drifting then it would hit that bar, and if the bars not there the radiator isnt very strong either
so basically bc its easier for you you wont? that bar is like wearing a shoe. its not gonna protect you from spikes sticking out the ground, but it will other things like rocks or glass.