Vehicles must retain the original chassis/body and if the chassis/body is to be altered in any way the alterations must be submitted for pre-approval to the Time Attack technical.
Has been and it's ok

No tube frame vehicles or tube frame chassis extensions are permissible unless part of the OEM structure as defined in points.
It's not a chassis tube frame, all OEM structure points standard

Space frame chassis of any description are not permitted, additional triangulation and bracing of suspension turret/mounting points is allowed.
It's not a space frame but it has got traingulations & bracing to mounting points.