[LoBelly]

Probably best to line up your engineer first and have him go through the rules you'll need.

My understanding is that the Kirkham is a pretty faithful replica in a lot of areas and if that is true for the frame then side intrusion is likely the be the biggest stumbling block.

My recollection is that there are a number of items where the opinion of the engineer comes into play any when the engineer was going over my cobra (pre-build) he gave a number of items a tick and was prepared to go with some of the things that came with the kit because 'that's the way they made it'

I dont think the torsion/beam will too much of an issue.

Once you know what you need out of the chassis (spec wise) you could try emailing the Kirkhams and seeing if they can provide the specs from their range and you'd then know what you were up for.

LoBelly