[Graham]

Luckily (or with hindsight) it seems you already made provisions for it in the 'Final Rules v5' albeit steel or B&W chassis.  Are you going to amend that to metal chassis to simplify things?

Yes I have ammended the rules to include metal, B&W and Steel chassis in Event 2d class. 
Revoslot chassis cars will also now be in that class and not in 2c Modified Class. But apart from myself no one else is now proposing to run a Revoslot anyway.