[boxhead]

Yep, talk to an engineer.

And stick with the same one right through.
In Vic I think Enklemanns are well respected.

I think the Kirkham chassis could either already be compliant or be made to fairly easily including side intrusion.

My biggest concern was the suspension parts, as I think an engineer would want to see reports on twisting, flex, welding and material composition?
I could be being over causious but best to be ready for the worst.
That was my main reason for wanting to look at a different chassis supplier, one that used known approved donor parts.