What Gauge steel for chassis repairs?

Hi all, have just cut off my front cross 'member' oooohh matron, to replace with new, and discovered a hole in the chassis winking at me like a rusty sheriffs badge in all it's glory! Any idea what gauge steel the chassis is made from?
Thanks All

 

12gauge magnum
Oops sorry wrong forum.

 

I use 2.5mm

 

I'm not entirely sure what its supposed to be, but I've been making my chassis bits out of 2mm, and some of 3mm, if that helps..

 

Although that said, I have used 3mm in places too!!

 

Thanks Gents for prompt replys, I have some 6 mm plate laying around from my rack & pinion fab, do you think that would be overkill, maybe not as much as @oscar's 12 gauge Magnum

 

6mm would probably fall into the "ship building" bracket

What part of the chassis are you looking at fixing?

 

Where the front cross member (passenger side) is spot welded to the chassis,

 

Yeah, 6mm is kinda overkill for just there