[Fran Hall RCR]

Craig.
Cool picture....
the difference in weight is not solely down to the body work but also the contruction of the chassis.
As both my cars are tube frame they are very similar in weight,the T70 has a little less material in the dash support structure but marginal....
The T70 body is lighter due to its simpler design,the GT40 body has a lot of internal ducting and extra pieces so will weigh a little more.
I would expect the difference to be around 100lbs total...when I have the time I will do a direct comparison for you....

The monocoque tub that is being developed will be lighter than the
tube frame and will be useable under any of the body styles .....available in about six months at the current rate