Nope dont think so who are they?
Think your right Frank by the time the cage is in i doubt it will be much lighter than a std version although the seats are lighter etc so im not sure, Im going to get it on a weigh bridge at some point to see, although new regs state the car cant weigh less than 720kgs so cant go to mad with an angle grinder fwn but it goes well for what it is once it gets onto the cam..